1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
36 #include "double-int.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
45 #include "stringpool.h"
48 #include "hard-reg-set.h"
51 #include "statistics.h"
53 #include "fixed-value.h"
54 #include "insn-config.h"
64 #include "diagnostic-core.h"
66 #include "langhooks.h"
70 #include "common/common-target.h"
71 #include "targhooks.h"
73 #include "dominance.h"
75 #include "basic-block.h"
78 #include "plugin-api.h"
83 #include "tree-chkp.h"
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data
87 declarations for e.g. AIX 4.x. */
90 /* The (assembler) name of the first globally-visible object output. */
91 extern GTY(()) const char *first_global_object_name
;
92 extern GTY(()) const char *weak_global_object_name
;
94 const char *first_global_object_name
;
95 const char *weak_global_object_name
;
98 struct constant_descriptor_rtx
;
99 struct rtx_constant_pool
;
101 #define n_deferred_constants (crtl->varasm.deferred_constants)
103 /* Number for making the label on the next
104 constant that is stored in memory. */
106 static GTY(()) int const_labelno
;
108 /* Carry information from ASM_DECLARE_OBJECT_NAME
109 to ASM_FINISH_DECLARE_OBJECT. */
111 int size_directive_output
;
113 /* The last decl for which assemble_variable was called,
114 if it did ASM_DECLARE_OBJECT_NAME.
115 If the last call to assemble_variable didn't do that,
118 tree last_assemble_variable_decl
;
120 /* The following global variable indicates if the first basic block
121 in a function belongs to the cold partition or not. */
123 bool first_function_block_is_cold
;
125 /* Whether we saw any functions with no_split_stack. */
127 static bool saw_no_split_stack
;
129 static const char *strip_reg_name (const char *);
130 static int contains_pointers_p (tree
);
131 #ifdef ASM_OUTPUT_EXTERNAL
132 static bool incorporeal_function_p (tree
);
134 static void decode_addr_const (tree
, struct addr_const
*);
135 static hashval_t
const_hash_1 (const tree
);
136 static int compare_constant (const tree
, const tree
);
137 static void output_constant_def_contents (rtx
);
138 static void output_addressed_constants (tree
);
139 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
141 static void globalize_decl (tree
);
142 static bool decl_readonly_section_1 (enum section_category
);
143 #ifdef BSS_SECTION_ASM_OP
144 #ifdef ASM_OUTPUT_ALIGNED_BSS
145 static void asm_output_aligned_bss (FILE *, tree
, const char *,
146 unsigned HOST_WIDE_INT
, int)
149 #endif /* BSS_SECTION_ASM_OP */
150 static void mark_weak (tree
);
151 static void output_constant_pool (const char *, tree
);
153 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
154 section
*text_section
;
155 section
*data_section
;
156 section
*readonly_data_section
;
157 section
*sdata_section
;
158 section
*ctors_section
;
159 section
*dtors_section
;
160 section
*bss_section
;
161 section
*sbss_section
;
163 /* Various forms of common section. All are guaranteed to be nonnull. */
164 section
*tls_comm_section
;
165 section
*comm_section
;
166 section
*lcomm_section
;
168 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
170 section
*bss_noswitch_section
;
172 /* The section that holds the main exception table, when known. The section
173 is set either by the target's init_sections hook or by the first call to
174 switch_to_exception_section. */
175 section
*exception_section
;
177 /* The section that holds the DWARF2 frame unwind information, when known.
178 The section is set either by the target's init_sections hook or by the
179 first call to switch_to_eh_frame_section. */
180 section
*eh_frame_section
;
182 /* asm_out_file's current section. This is NULL if no section has yet
183 been selected or if we lose track of what the current section is. */
186 /* True if code for the current function is currently being directed
187 at the cold section. */
188 bool in_cold_section_p
;
190 /* A linked list of all the unnamed sections. */
191 static GTY(()) section
*unnamed_sections
;
193 /* Return a nonzero value if DECL has a section attribute. */
194 #define IN_NAMED_SECTION(DECL) \
195 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
196 && DECL_SECTION_NAME (DECL) != NULL)
198 struct section_hasher
: ggc_hasher
<section
*>
200 typedef const char *compare_type
;
202 static hashval_t
hash (section
*);
203 static bool equal (section
*, const char *);
206 /* Hash table of named sections. */
207 static GTY(()) hash_table
<section_hasher
> *section_htab
;
209 struct object_block_hasher
: ggc_hasher
<object_block
*>
211 typedef const section
*compare_type
;
213 static hashval_t
hash (object_block
*);
214 static bool equal (object_block
*, const section
*);
217 /* A table of object_blocks, indexed by section. */
218 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
220 /* The next number to use for internal anchor labels. */
221 static GTY(()) int anchor_labelno
;
223 /* A pool of constants that can be shared between functions. */
224 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
226 /* Helper routines for maintaining section_htab. */
229 section_hasher::equal (section
*old
, const char *new_name
)
231 return strcmp (old
->named
.name
, new_name
) == 0;
235 section_hasher::hash (section
*old
)
237 return htab_hash_string (old
->named
.name
);
240 /* Return a hash value for section SECT. */
243 hash_section (section
*sect
)
245 if (sect
->common
.flags
& SECTION_NAMED
)
246 return htab_hash_string (sect
->named
.name
);
247 return sect
->common
.flags
;
250 /* Helper routines for maintaining object_block_htab. */
253 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
255 return old
->sect
== new_section
;
259 object_block_hasher::hash (object_block
*old
)
261 return hash_section (old
->sect
);
264 /* Return a new unnamed section with the given fields. */
267 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
272 sect
= ggc_alloc
<section
> ();
273 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
274 sect
->unnamed
.callback
= callback
;
275 sect
->unnamed
.data
= data
;
276 sect
->unnamed
.next
= unnamed_sections
;
278 unnamed_sections
= sect
;
282 /* Return a SECTION_NOSWITCH section with the given fields. */
285 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
289 sect
= ggc_alloc
<section
> ();
290 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
291 sect
->noswitch
.callback
= callback
;
296 /* Return the named section structure associated with NAME. Create
297 a new section with the given fields if no such structure exists. */
300 get_section (const char *name
, unsigned int flags
, tree decl
)
302 section
*sect
, **slot
;
304 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
306 flags
|= SECTION_NAMED
;
309 sect
= ggc_alloc
<section
> ();
310 sect
->named
.common
.flags
= flags
;
311 sect
->named
.name
= ggc_strdup (name
);
312 sect
->named
.decl
= decl
;
318 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
319 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
321 /* It is fine if one of the section flags is
322 SECTION_WRITE | SECTION_RELRO and the other has none of these
323 flags (i.e. read-only) in named sections and either the
324 section hasn't been declared yet or has been declared as writable.
325 In that case just make sure the resulting flags are
326 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
328 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
329 == (SECTION_WRITE
| SECTION_RELRO
)
330 && (sect
->common
.flags
331 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
332 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
333 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
334 || (sect
->common
.flags
& SECTION_WRITE
)))
336 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
339 /* Sanity check user variables for flag changes. */
340 if (sect
->named
.decl
!= NULL
341 && DECL_P (sect
->named
.decl
)
342 && decl
!= sect
->named
.decl
)
344 if (decl
!= NULL
&& DECL_P (decl
))
345 error ("%+D causes a section type conflict with %D",
346 decl
, sect
->named
.decl
);
348 error ("section type conflict with %D", sect
->named
.decl
);
349 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
350 "%qD was declared here", sect
->named
.decl
);
352 else if (decl
!= NULL
&& DECL_P (decl
))
353 error ("%+D causes a section type conflict", decl
);
355 error ("section type conflict");
356 /* Make sure we don't error about one section multiple times. */
357 sect
->common
.flags
|= SECTION_OVERRIDE
;
363 /* Return true if the current compilation mode benefits from having
364 objects grouped into blocks. */
367 use_object_blocks_p (void)
369 return flag_section_anchors
;
372 /* Return the object_block structure for section SECT. Create a new
373 structure if we haven't created one already. Return null if SECT
376 static struct object_block
*
377 get_block_for_section (section
*sect
)
379 struct object_block
*block
;
385 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
390 block
= ggc_cleared_alloc
<object_block
> ();
397 /* Create a symbol with label LABEL and place it at byte offset
398 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
399 is not yet known. LABEL must be a garbage-collected string. */
402 create_block_symbol (const char *label
, struct object_block
*block
,
403 HOST_WIDE_INT offset
)
408 /* Create the extended SYMBOL_REF. */
409 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
410 symbol
= (rtx
) ggc_internal_alloc (size
);
412 /* Initialize the normal SYMBOL_REF fields. */
413 memset (symbol
, 0, size
);
414 PUT_CODE (symbol
, SYMBOL_REF
);
415 PUT_MODE (symbol
, Pmode
);
416 XSTR (symbol
, 0) = label
;
417 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
419 /* Initialize the block_symbol stuff. */
420 SYMBOL_REF_BLOCK (symbol
) = block
;
421 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
426 /* Return a section with a particular name and with whatever SECTION_*
427 flags section_type_flags deems appropriate. The name of the section
428 is taken from NAME if nonnull, otherwise it is taken from DECL's
429 DECL_SECTION_NAME. DECL is the decl associated with the section
430 (see the section comment for details) and RELOC is as for
431 section_type_flags. */
434 get_named_section (tree decl
, const char *name
, int reloc
)
440 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
441 name
= DECL_SECTION_NAME (decl
);
444 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
445 return get_section (name
, flags
, decl
);
448 /* Worker for resolve_unique_section. */
451 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
453 n
->implicit_section
= true;
457 /* If required, set DECL_SECTION_NAME to a unique name. */
460 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
461 int flag_function_or_data_sections
)
463 if (DECL_SECTION_NAME (decl
) == NULL
464 && targetm_common
.have_named_sections
465 && (flag_function_or_data_sections
466 || DECL_COMDAT_GROUP (decl
)))
468 targetm
.asm_out
.unique_section (decl
, reloc
);
469 if (DECL_SECTION_NAME (decl
))
470 symtab_node::get (decl
)->call_for_symbol_and_aliases
471 (set_implicit_section
, NULL
, true);
475 #ifdef BSS_SECTION_ASM_OP
477 #ifdef ASM_OUTPUT_ALIGNED_BSS
479 /* Utility function for targets to use in implementing
480 ASM_OUTPUT_ALIGNED_BSS.
481 ??? It is believed that this function will work in most cases so such
482 support is localized here. */
485 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
486 const char *name
, unsigned HOST_WIDE_INT size
,
489 switch_to_section (bss_section
);
490 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
491 #ifdef ASM_DECLARE_OBJECT_NAME
492 last_assemble_variable_decl
= decl
;
493 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
495 /* Standard thing is just output label for the object. */
496 ASM_OUTPUT_LABEL (file
, name
);
497 #endif /* ASM_DECLARE_OBJECT_NAME */
498 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
503 #endif /* BSS_SECTION_ASM_OP */
505 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
506 /* Return the hot section for function DECL. Return text_section for
510 hot_function_section (tree decl
)
512 if (decl
!= NULL_TREE
513 && DECL_SECTION_NAME (decl
) != NULL
514 && targetm_common
.have_named_sections
)
515 return get_named_section (decl
, NULL
, 0);
521 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
524 When DECL_SECTION_NAME is non-NULL and it is implicit section and
525 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
526 concatenate the name with NAMED_SECTION_SUFFIX.
527 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
530 get_named_text_section (tree decl
,
531 const char *text_section_name
,
532 const char *named_section_suffix
)
534 if (decl
&& DECL_SECTION_NAME (decl
))
536 if (named_section_suffix
)
538 const char *dsn
= DECL_SECTION_NAME (decl
);
539 const char *stripped_name
;
542 name
= (char *) alloca (strlen (dsn
) + 1);
546 stripped_name
= targetm
.strip_name_encoding (name
);
548 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
549 return get_named_section (decl
, buffer
, 0);
551 else if (symtab_node::get (decl
)->implicit_section
)
555 /* Do not try to split gnu_linkonce functions. This gets somewhat
557 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
559 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
560 name
= targetm
.strip_name_encoding (name
);
561 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
567 return get_named_section (decl
, text_section_name
, 0);
570 /* Choose named function section based on its frequency. */
573 default_function_section (tree decl
, enum node_frequency freq
,
574 bool startup
, bool exit
)
576 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
577 /* Old GNU linkers have buggy --gc-section support, which sometimes
578 results in .gcc_except_table* sections being garbage collected. */
580 && symtab_node::get (decl
)->implicit_section
)
584 if (!flag_reorder_functions
585 || !targetm_common
.have_named_sections
)
587 /* Startup code should go to startup subsection unless it is
588 unlikely executed (this happens especially with function splitting
589 where we can split away unnecessary parts of static constructors. */
590 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
592 /* If we do have a profile or(and) LTO phase is executed, we do not need
593 these ELF section. */
594 if (!in_lto_p
|| !flag_profile_values
)
595 return get_named_text_section (decl
, ".text.startup", NULL
);
600 /* Similarly for exit. */
601 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
602 return get_named_text_section (decl
, ".text.exit", NULL
);
604 /* Group cold functions together, similarly for hot code. */
607 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
608 return get_named_text_section (decl
, ".text.unlikely", NULL
);
609 case NODE_FREQUENCY_HOT
:
610 /* If we do have a profile or(and) LTO phase is executed, we do not need
611 these ELF section. */
612 if (!in_lto_p
|| !flag_profile_values
)
613 return get_named_text_section (decl
, ".text.hot", NULL
);
619 /* Return the section for function DECL.
621 If DECL is NULL_TREE, return the text section. We can be passed
622 NULL_TREE under some circumstances by dbxout.c at least.
624 If FORCE_COLD is true, return cold function section ignoring
625 the frequency info of cgraph_node. */
628 function_section_1 (tree decl
, bool force_cold
)
630 section
*section
= NULL
;
631 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
632 bool startup
= false, exit
= false;
636 struct cgraph_node
*node
= cgraph_node::get (decl
);
640 freq
= node
->frequency
;
641 startup
= node
->only_called_at_startup
;
642 exit
= node
->only_called_at_exit
;
646 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
648 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
649 if (decl
!= NULL_TREE
650 && DECL_SECTION_NAME (decl
) != NULL
)
652 if (targetm
.asm_out
.function_section
)
653 section
= targetm
.asm_out
.function_section (decl
, freq
,
657 return get_named_section (decl
, NULL
, 0);
660 return targetm
.asm_out
.select_section
661 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
662 symtab_node::get (decl
)->definition_alignment ());
664 if (targetm
.asm_out
.function_section
)
665 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
668 return hot_function_section (decl
);
672 /* Return the section for function DECL.
674 If DECL is NULL_TREE, return the text section. We can be passed
675 NULL_TREE under some circumstances by dbxout.c at least. */
678 function_section (tree decl
)
680 /* Handle cases where function splitting code decides
681 to put function entry point into unlikely executed section
682 despite the fact that the function itself is not cold
683 (i.e. it is called rarely but contains a hot loop that is
684 better to live in hot subsection for the code locality). */
685 return function_section_1 (decl
,
686 first_function_block_is_cold
);
689 /* Return the section for the current function, take IN_COLD_SECTION_P
693 current_function_section (void)
695 return function_section_1 (current_function_decl
, in_cold_section_p
);
698 /* Tell assembler to switch to unlikely-to-be-executed text section. */
701 unlikely_text_section (void)
703 return function_section_1 (current_function_decl
, true);
706 /* When called within a function context, return true if the function
707 has been assigned a cold text section and if SECT is that section.
708 When called outside a function context, return true if SECT is the
709 default cold section. */
712 unlikely_text_section_p (section
*sect
)
714 return sect
== function_section_1 (current_function_decl
, true);
717 /* Return the read-only data section associated with function DECL. */
720 default_function_rodata_section (tree decl
)
722 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
724 const char *name
= DECL_SECTION_NAME (decl
);
726 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
732 dot
= strchr (name
+ 1, '.');
735 len
= strlen (dot
) + 8;
736 rname
= (char *) alloca (len
);
738 strcpy (rname
, ".rodata");
740 return get_section (rname
, SECTION_LINKONCE
, decl
);
742 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
743 else if (DECL_COMDAT_GROUP (decl
)
744 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
746 size_t len
= strlen (name
) + 1;
747 char *rname
= (char *) alloca (len
);
749 memcpy (rname
, name
, len
);
751 return get_section (rname
, SECTION_LINKONCE
, decl
);
753 /* For .text.foo we want to use .rodata.foo. */
754 else if (flag_function_sections
&& flag_data_sections
755 && strncmp (name
, ".text.", 6) == 0)
757 size_t len
= strlen (name
) + 1;
758 char *rname
= (char *) alloca (len
+ 2);
760 memcpy (rname
, ".rodata", 7);
761 memcpy (rname
+ 7, name
+ 5, len
- 5);
762 return get_section (rname
, 0, decl
);
766 return readonly_data_section
;
769 /* Return the read-only data section associated with function DECL
770 for targets where that section should be always the single
771 readonly data section. */
774 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
776 return readonly_data_section
;
779 /* Return the section to use for string merging. */
782 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
783 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
784 unsigned int flags ATTRIBUTE_UNUSED
)
788 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
789 && TREE_CODE (decl
) == STRING_CST
790 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
792 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
793 && TREE_STRING_LENGTH (decl
) >= len
)
796 unsigned int modesize
;
800 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
801 char *name
= (char *) alloca (strlen (prefix
) + 30);
803 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
804 modesize
= GET_MODE_BITSIZE (mode
);
805 if (modesize
>= 8 && modesize
<= 256
806 && (modesize
& (modesize
- 1)) == 0)
808 if (align
< modesize
)
811 str
= TREE_STRING_POINTER (decl
);
812 unit
= GET_MODE_SIZE (mode
);
814 /* Check for embedded NUL characters. */
815 for (i
= 0; i
< len
; i
+= unit
)
817 for (j
= 0; j
< unit
; j
++)
818 if (str
[i
+ j
] != '\0')
825 sprintf (name
, "%s.str%d.%d", prefix
,
826 modesize
/ 8, (int) (align
/ 8));
827 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
828 return get_section (name
, flags
, NULL
);
833 return readonly_data_section
;
836 /* Return the section to use for constant merging. */
839 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
840 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
841 unsigned int flags ATTRIBUTE_UNUSED
)
843 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
845 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
851 && (align
& (align
- 1)) == 0)
853 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
854 char *name
= (char *) alloca (strlen (prefix
) + 30);
856 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
857 flags
|= (align
/ 8) | SECTION_MERGE
;
858 return get_section (name
, flags
, NULL
);
860 return readonly_data_section
;
863 /* Given NAME, a putative register name, discard any customary prefixes. */
866 strip_reg_name (const char *name
)
868 #ifdef REGISTER_PREFIX
869 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
870 name
+= strlen (REGISTER_PREFIX
);
872 if (name
[0] == '%' || name
[0] == '#')
877 /* The user has asked for a DECL to have a particular name. Set (or
878 change) it in such a way that we don't prefix an underscore to
881 set_user_assembler_name (tree decl
, const char *name
)
883 char *starred
= (char *) alloca (strlen (name
) + 2);
885 strcpy (starred
+ 1, name
);
886 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
887 SET_DECL_RTL (decl
, NULL_RTX
);
890 /* Decode an `asm' spec for a declaration as a register name.
891 Return the register number, or -1 if nothing specified,
892 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
893 or -3 if ASMSPEC is `cc' and is not recognized,
894 or -4 if ASMSPEC is `memory' and is not recognized.
895 Accept an exact spelling or a decimal number.
896 Prefixes such as % are optional. */
899 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
901 /* Presume just one register is clobbered. */
908 /* Get rid of confusing prefixes. */
909 asmspec
= strip_reg_name (asmspec
);
911 /* Allow a decimal number as a "register name". */
912 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
913 if (! ISDIGIT (asmspec
[i
]))
915 if (asmspec
[0] != 0 && i
< 0)
918 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
924 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
926 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
929 #ifdef OVERLAPPING_REGISTER_NAMES
933 const char *const name
;
936 } table
[] = OVERLAPPING_REGISTER_NAMES
;
938 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
940 && ! strcmp (asmspec
, table
[i
].name
))
942 *pnregs
= table
[i
].nregs
;
943 return table
[i
].number
;
946 #endif /* OVERLAPPING_REGISTER_NAMES */
948 #ifdef ADDITIONAL_REGISTER_NAMES
950 static const struct { const char *const name
; const int number
; } table
[]
951 = ADDITIONAL_REGISTER_NAMES
;
953 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
955 && ! strcmp (asmspec
, table
[i
].name
)
956 && reg_names
[table
[i
].number
][0])
957 return table
[i
].number
;
959 #endif /* ADDITIONAL_REGISTER_NAMES */
961 if (!strcmp (asmspec
, "memory"))
964 if (!strcmp (asmspec
, "cc"))
974 decode_reg_name (const char *name
)
977 return decode_reg_name_and_count (name
, &count
);
981 /* Return true if DECL's initializer is suitable for a BSS section. */
984 bss_initializer_p (const_tree decl
)
986 return (DECL_INITIAL (decl
) == NULL
987 /* In LTO we have no errors in program; error_mark_node is used
988 to mark offlined constructors. */
989 || (DECL_INITIAL (decl
) == error_mark_node
991 || (flag_zero_initialized_in_bss
992 /* Leave constant zeroes in .rodata so they
994 && !TREE_READONLY (decl
)
995 && initializer_zerop (DECL_INITIAL (decl
))));
998 /* Compute the alignment of variable specified by DECL.
999 DONT_OUTPUT_DATA is from assemble_variable. */
1002 align_variable (tree decl
, bool dont_output_data
)
1004 unsigned int align
= DECL_ALIGN (decl
);
1006 /* In the case for initialing an array whose length isn't specified,
1007 where we have not yet been able to do the layout,
1008 figure out the proper alignment now. */
1009 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1010 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1011 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1013 /* Some object file formats have a maximum alignment which they support.
1014 In particular, a.out format supports a maximum alignment of 4. */
1015 if (align
> MAX_OFILE_ALIGNMENT
)
1017 error ("alignment of %q+D is greater than maximum object "
1018 "file alignment %d", decl
,
1019 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1020 align
= MAX_OFILE_ALIGNMENT
;
1023 if (! DECL_USER_ALIGN (decl
))
1025 #ifdef DATA_ABI_ALIGNMENT
1026 unsigned int data_abi_align
1027 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1028 /* For backwards compatibility, don't assume the ABI alignment for
1030 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1031 align
= data_abi_align
;
1034 /* On some machines, it is good to increase alignment sometimes.
1035 But as DECL_ALIGN is used both for actually emitting the variable
1036 and for code accessing the variable as guaranteed alignment, we
1037 can only increase the alignment if it is a performance optimization
1038 if the references to it must bind to the current definition. */
1039 if (decl_binds_to_current_def_p (decl
)
1040 && !DECL_VIRTUAL_P (decl
))
1042 #ifdef DATA_ALIGNMENT
1043 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1044 /* Don't increase alignment too much for TLS variables - TLS space
1046 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1049 #ifdef CONSTANT_ALIGNMENT
1050 if (DECL_INITIAL (decl
) != 0
1051 /* In LTO we have no errors in program; error_mark_node is used
1052 to mark offlined constructors. */
1053 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1055 unsigned int const_align
1056 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1057 /* Don't increase alignment too much for TLS variables - TLS
1058 space is too precious. */
1059 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1060 align
= const_align
;
1066 /* Reset the alignment in case we have made it tighter, so we can benefit
1067 from it in get_pointer_alignment. */
1068 DECL_ALIGN (decl
) = align
;
1071 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1072 beyond what align_variable returned. */
1075 get_variable_align (tree decl
)
1077 unsigned int align
= DECL_ALIGN (decl
);
1079 /* For user aligned vars or static vars align_variable already did
1081 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1084 #ifdef DATA_ABI_ALIGNMENT
1085 if (DECL_THREAD_LOCAL_P (decl
))
1086 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1089 /* For decls that bind to the current definition, align_variable
1090 did also everything, except for not assuming ABI required alignment
1091 of TLS variables. For other vars, increase the alignment here
1092 as an optimization. */
1093 if (!decl_binds_to_current_def_p (decl
))
1095 /* On some machines, it is good to increase alignment sometimes. */
1096 #ifdef DATA_ALIGNMENT
1097 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1098 /* Don't increase alignment too much for TLS variables - TLS space
1100 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1103 #ifdef CONSTANT_ALIGNMENT
1104 if (DECL_INITIAL (decl
) != 0
1105 /* In LTO we have no errors in program; error_mark_node is used
1106 to mark offlined constructors. */
1107 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1109 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1111 /* Don't increase alignment too much for TLS variables - TLS space
1113 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1114 align
= const_align
;
1122 /* Return the section into which the given VAR_DECL or CONST_DECL
1123 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1124 section should be used wherever possible. */
1127 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1129 addr_space_t as
= ADDR_SPACE_GENERIC
;
1131 varpool_node
*vnode
= varpool_node::get (decl
);
1134 vnode
= vnode
->ultimate_alias_target ();
1138 if (TREE_TYPE (decl
) != error_mark_node
)
1139 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1141 /* We need the constructor to figure out reloc flag. */
1143 vnode
->get_constructor ();
1145 if (DECL_COMMON (decl
))
1147 /* If the decl has been given an explicit section name, or it resides
1148 in a non-generic address space, then it isn't common, and shouldn't
1149 be handled as such. */
1150 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1151 && ADDR_SPACE_GENERIC_P (as
));
1152 if (DECL_THREAD_LOCAL_P (decl
))
1153 return tls_comm_section
;
1154 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1155 return comm_section
;
1158 if (DECL_INITIAL (decl
) == error_mark_node
)
1159 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1160 else if (DECL_INITIAL (decl
))
1161 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1165 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1166 if (IN_NAMED_SECTION (decl
))
1167 return get_named_section (decl
, NULL
, reloc
);
1169 if (ADDR_SPACE_GENERIC_P (as
)
1170 && !DECL_THREAD_LOCAL_P (decl
)
1171 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1172 && bss_initializer_p (decl
))
1174 if (!TREE_PUBLIC (decl
)
1175 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1176 && asan_protect_global (decl
)))
1177 return lcomm_section
;
1178 if (bss_noswitch_section
)
1179 return bss_noswitch_section
;
1182 return targetm
.asm_out
.select_section (decl
, reloc
,
1183 get_variable_align (decl
));
1186 /* Return the block into which object_block DECL should be placed. */
1188 static struct object_block
*
1189 get_block_for_decl (tree decl
)
1193 if (TREE_CODE (decl
) == VAR_DECL
)
1195 /* The object must be defined in this translation unit. */
1196 if (DECL_EXTERNAL (decl
))
1199 /* There's no point using object blocks for something that is
1200 isolated by definition. */
1201 if (DECL_COMDAT_GROUP (decl
))
1205 /* We can only calculate block offsets if the decl has a known
1207 if (DECL_SIZE_UNIT (decl
) == NULL
)
1209 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1212 /* Find out which section should contain DECL. We cannot put it into
1213 an object block if it requires a standalone definition. */
1214 if (TREE_CODE (decl
) == VAR_DECL
)
1215 align_variable (decl
, 0);
1216 sect
= get_variable_section (decl
, true);
1217 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1220 return get_block_for_section (sect
);
1223 /* Make sure block symbol SYMBOL is in block BLOCK. */
1226 change_symbol_block (rtx symbol
, struct object_block
*block
)
1228 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1230 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1231 SYMBOL_REF_BLOCK (symbol
) = block
;
1235 /* Return true if it is possible to put DECL in an object_block. */
1238 use_blocks_for_decl_p (tree decl
)
1240 struct symtab_node
*snode
;
1242 /* Only data DECLs can be placed into object blocks. */
1243 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1246 /* Detect decls created by dw2_force_const_mem. Such decls are
1247 special because DECL_INITIAL doesn't specify the decl's true value.
1248 dw2_output_indirect_constants will instead call assemble_variable
1249 with dont_output_data set to 1 and then print the contents itself. */
1250 if (DECL_INITIAL (decl
) == decl
)
1253 /* If this decl is an alias, then we don't want to emit a
1255 if (TREE_CODE (decl
) == VAR_DECL
1256 && (snode
= symtab_node::get (decl
)) != NULL
1260 return targetm
.use_blocks_for_decl_p (decl
);
1263 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1264 until we find an identifier that is not itself a transparent alias.
1265 Modify the alias passed to it by reference (and all aliases on the
1266 way to the ultimate target), such that they do not have to be
1267 followed again, and return the ultimate target of the alias
1271 ultimate_transparent_alias_target (tree
*alias
)
1273 tree target
= *alias
;
1275 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1277 gcc_assert (TREE_CHAIN (target
));
1278 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1279 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1280 && ! TREE_CHAIN (target
));
1287 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1288 have static storage duration. In other words, it should not be an
1289 automatic variable, including PARM_DECLs.
1291 There is, however, one exception: this function handles variables
1292 explicitly placed in a particular register by the user.
1294 This is never called for PARM_DECL nodes. */
1297 make_decl_rtl (tree decl
)
1299 const char *name
= 0;
1304 /* Check that we are not being given an automatic variable. */
1305 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1306 && TREE_CODE (decl
) != RESULT_DECL
);
1308 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1309 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1310 || TREE_STATIC (decl
)
1311 || TREE_PUBLIC (decl
)
1312 || DECL_EXTERNAL (decl
)
1313 || DECL_REGISTER (decl
));
1315 /* And that we were not given a type or a label. */
1316 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1317 && TREE_CODE (decl
) != LABEL_DECL
);
1319 /* For a duplicate declaration, we can be called twice on the
1320 same DECL node. Don't discard the RTL already made. */
1321 if (DECL_RTL_SET_P (decl
))
1323 /* If the old RTL had the wrong mode, fix the mode. */
1324 x
= DECL_RTL (decl
);
1325 if (GET_MODE (x
) != DECL_MODE (decl
))
1326 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1328 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1331 /* ??? Another way to do this would be to maintain a hashed
1332 table of such critters. Instead of adding stuff to a DECL
1333 to give certain attributes to it, we could use an external
1334 hash map from DECL to set of attributes. */
1336 /* Let the target reassign the RTL if it wants.
1337 This is necessary, for example, when one machine specific
1338 decl attribute overrides another. */
1339 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1341 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1342 on the new decl information. */
1344 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1345 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1346 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1351 /* If this variable belongs to the global constant pool, retrieve the
1352 pre-computed RTL or recompute it in LTO mode. */
1353 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1355 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1359 id
= DECL_ASSEMBLER_NAME (decl
);
1360 if (TREE_CODE (decl
) == FUNCTION_DECL
1361 && cgraph_node::get (decl
)
1362 && cgraph_node::get (decl
)->instrumentation_clone
)
1363 ultimate_transparent_alias_target (&id
);
1364 name
= IDENTIFIER_POINTER (id
);
1366 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1367 && DECL_REGISTER (decl
))
1369 error ("register name not specified for %q+D", decl
);
1371 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1373 const char *asmspec
= name
+1;
1374 machine_mode mode
= DECL_MODE (decl
);
1375 reg_number
= decode_reg_name (asmspec
);
1376 /* First detect errors in declaring global registers. */
1377 if (reg_number
== -1)
1378 error ("register name not specified for %q+D", decl
);
1379 else if (reg_number
< 0)
1380 error ("invalid register name for %q+D", decl
);
1381 else if (mode
== BLKmode
)
1382 error ("data type of %q+D isn%'t suitable for a register",
1384 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1385 error ("the register specified for %q+D cannot be accessed"
1386 " by the current target", decl
);
1387 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1388 error ("the register specified for %q+D is not general enough"
1389 " to be used as a register variable", decl
);
1390 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1391 error ("register specified for %q+D isn%'t suitable for data type",
1393 /* Now handle properly declared static register variables. */
1398 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1400 DECL_INITIAL (decl
) = 0;
1401 error ("global register variable has initial value");
1403 if (TREE_THIS_VOLATILE (decl
))
1404 warning (OPT_Wvolatile_register_var
,
1405 "optimization may eliminate reads and/or "
1406 "writes to register variables");
1408 /* If the user specified one of the eliminables registers here,
1409 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1410 confused with that register and be eliminated. This usage is
1411 somewhat suspect... */
1413 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1414 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1415 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1417 if (TREE_STATIC (decl
))
1419 /* Make this register global, so not usable for anything
1421 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1422 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1423 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1425 nregs
= hard_regno_nregs
[reg_number
][mode
];
1427 globalize_reg (decl
, reg_number
+ --nregs
);
1430 /* As a register variable, it has no section. */
1433 /* Avoid internal errors from invalid register
1435 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1436 DECL_HARD_REGISTER (decl
) = 0;
1439 /* Now handle ordinary static variables and functions (in memory).
1440 Also handle vars declared register invalidly. */
1441 else if (name
[0] == '*')
1443 #ifdef REGISTER_PREFIX
1444 if (strlen (REGISTER_PREFIX
) != 0)
1446 reg_number
= decode_reg_name (name
);
1447 if (reg_number
>= 0 || reg_number
== -3)
1448 error ("register name given for non-register variable %q+D", decl
);
1453 /* Specifying a section attribute on a variable forces it into a
1454 non-.bss section, and thus it cannot be common. */
1455 /* FIXME: In general this code should not be necessary because
1456 visibility pass is doing the same work. But notice_global_symbol
1457 is called early and it needs to make DECL_RTL to get the name.
1458 we take care of recomputing the DECL_RTL after visibility is changed. */
1459 if (TREE_CODE (decl
) == VAR_DECL
1460 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1461 && DECL_SECTION_NAME (decl
) != NULL
1462 && DECL_INITIAL (decl
) == NULL_TREE
1463 && DECL_COMMON (decl
))
1464 DECL_COMMON (decl
) = 0;
1466 /* Variables can't be both common and weak. */
1467 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1468 DECL_COMMON (decl
) = 0;
1470 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1471 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1474 machine_mode address_mode
= Pmode
;
1475 if (TREE_TYPE (decl
) != error_mark_node
)
1477 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1478 address_mode
= targetm
.addr_space
.address_mode (as
);
1480 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1482 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1483 SET_SYMBOL_REF_DECL (x
, decl
);
1485 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1486 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1487 set_mem_attributes (x
, decl
, 1);
1488 SET_DECL_RTL (decl
, x
);
1490 /* Optionally set flags or add text to the name to record information
1491 such as that it is a function name.
1492 If the name is changed, the macro ASM_OUTPUT_LABELREF
1493 will have to know how to strip this information. */
1494 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1497 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1498 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1502 make_decl_rtl_for_debug (tree decl
)
1504 unsigned int save_aliasing_flag
;
1507 if (DECL_RTL_SET_P (decl
))
1508 return DECL_RTL (decl
);
1510 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1511 call new_alias_set. If running with -fcompare-debug, sometimes
1512 we do not want to create alias sets that will throw the alias
1513 numbers off in the comparison dumps. So... clearing
1514 flag_strict_aliasing will keep new_alias_set() from creating a
1516 save_aliasing_flag
= flag_strict_aliasing
;
1517 flag_strict_aliasing
= 0;
1519 rtl
= DECL_RTL (decl
);
1520 /* Reset DECL_RTL back, as various parts of the compiler expects
1521 DECL_RTL set meaning it is actually going to be output. */
1522 SET_DECL_RTL (decl
, NULL
);
1524 flag_strict_aliasing
= save_aliasing_flag
;
1528 /* Output a string of literal assembler code
1529 for an `asm' keyword used between functions. */
1532 assemble_asm (tree string
)
1537 if (TREE_CODE (string
) == ADDR_EXPR
)
1538 string
= TREE_OPERAND (string
, 0);
1540 p
= TREE_STRING_POINTER (string
);
1541 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1544 /* Write the address of the entity given by SYMBOL to SEC. */
1546 assemble_addr_to_section (rtx symbol
, section
*sec
)
1548 switch_to_section (sec
);
1549 assemble_align (POINTER_SIZE
);
1550 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1553 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1554 not) section for PRIORITY. */
1556 get_cdtor_priority_section (int priority
, bool constructor_p
)
1560 /* ??? This only works reliably with the GNU linker. */
1561 sprintf (buf
, "%s.%.5u",
1562 constructor_p
? ".ctors" : ".dtors",
1563 /* Invert the numbering so the linker puts us in the proper
1564 order; constructors are run from right to left, and the
1565 linker sorts in increasing order. */
1566 MAX_INIT_PRIORITY
- priority
);
1567 return get_section (buf
, SECTION_WRITE
, NULL
);
1571 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1575 if (priority
!= DEFAULT_INIT_PRIORITY
)
1576 sec
= get_cdtor_priority_section (priority
,
1577 /*constructor_p=*/false);
1579 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1581 assemble_addr_to_section (symbol
, sec
);
1584 #ifdef DTORS_SECTION_ASM_OP
1586 default_dtor_section_asm_out_destructor (rtx symbol
,
1587 int priority ATTRIBUTE_UNUSED
)
1589 assemble_addr_to_section (symbol
, dtors_section
);
1594 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1598 if (priority
!= DEFAULT_INIT_PRIORITY
)
1599 sec
= get_cdtor_priority_section (priority
,
1600 /*constructor_p=*/true);
1602 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1604 assemble_addr_to_section (symbol
, sec
);
1607 #ifdef CTORS_SECTION_ASM_OP
1609 default_ctor_section_asm_out_constructor (rtx symbol
,
1610 int priority ATTRIBUTE_UNUSED
)
1612 assemble_addr_to_section (symbol
, ctors_section
);
1616 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1617 a nonzero value if the constant pool should be output before the
1618 start of the function, or a zero value if the pool should output
1619 after the end of the function. The default is to put it before the
1622 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1623 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1626 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1627 to be output to assembler.
1628 Set first_global_object_name and weak_global_object_name as appropriate. */
1631 notice_global_symbol (tree decl
)
1633 const char **t
= &first_global_object_name
;
1635 if (first_global_object_name
1636 || !TREE_PUBLIC (decl
)
1637 || DECL_EXTERNAL (decl
)
1638 || !DECL_NAME (decl
)
1639 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1640 || (TREE_CODE (decl
) != FUNCTION_DECL
1641 && (TREE_CODE (decl
) != VAR_DECL
1642 || (DECL_COMMON (decl
)
1643 && (DECL_INITIAL (decl
) == 0
1644 || DECL_INITIAL (decl
) == error_mark_node
)))))
1647 /* We win when global object is found, but it is useful to know about weak
1648 symbol as well so we can produce nicer unique names. */
1649 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1650 t
= &weak_global_object_name
;
1654 tree id
= DECL_ASSEMBLER_NAME (decl
);
1655 ultimate_transparent_alias_target (&id
);
1656 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1660 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1661 current function goes into the cold section, so that targets can use
1662 current_function_section during RTL expansion. DECL describes the
1666 decide_function_section (tree decl
)
1668 first_function_block_is_cold
= false;
1670 if (flag_reorder_blocks_and_partition
)
1671 /* We will decide in assemble_start_function. */
1674 if (DECL_SECTION_NAME (decl
))
1676 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1677 /* Calls to function_section rely on first_function_block_is_cold
1679 first_function_block_is_cold
= (node
1681 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1684 in_cold_section_p
= first_function_block_is_cold
;
1687 /* Get the function's name, as described by its RTL. This may be
1688 different from the DECL_NAME name used in the source file. */
1690 get_fnname_from_decl (tree decl
)
1692 rtx x
= DECL_RTL (decl
);
1693 gcc_assert (MEM_P (x
));
1695 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1699 /* Output assembler code for the constant pool of a function and associated
1700 with defining the name of the function. DECL describes the function.
1701 NAME is the function's name. For the constant pool, we use the current
1702 constant pool data. */
1705 assemble_start_function (tree decl
, const char *fnname
)
1708 char tmp_label
[100];
1709 bool hot_label_written
= false;
1711 if (flag_reorder_blocks_and_partition
)
1713 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1714 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1715 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1716 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1717 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1718 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1719 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1720 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1725 crtl
->subsections
.hot_section_label
= NULL
;
1726 crtl
->subsections
.cold_section_label
= NULL
;
1727 crtl
->subsections
.hot_section_end_label
= NULL
;
1728 crtl
->subsections
.cold_section_end_label
= NULL
;
1731 /* The following code does not need preprocessing in the assembler. */
1735 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1736 output_constant_pool (fnname
, decl
);
1738 align
= symtab_node::get (decl
)->definition_alignment ();
1740 /* Make sure the not and cold text (code) sections are properly
1741 aligned. This is necessary here in the case where the function
1742 has both hot and cold sections, because we don't want to re-set
1743 the alignment when the section switch happens mid-function. */
1745 if (flag_reorder_blocks_and_partition
)
1747 first_function_block_is_cold
= false;
1749 switch_to_section (unlikely_text_section ());
1750 assemble_align (align
);
1751 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1753 /* When the function starts with a cold section, we need to explicitly
1754 align the hot section and write out the hot section label.
1755 But if the current function is a thunk, we do not have a CFG. */
1757 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1759 switch_to_section (text_section
);
1760 assemble_align (align
);
1761 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1762 hot_label_written
= true;
1763 first_function_block_is_cold
= true;
1765 in_cold_section_p
= first_function_block_is_cold
;
1769 /* Switch to the correct text section for the start of the function. */
1771 switch_to_section (function_section (decl
));
1772 if (flag_reorder_blocks_and_partition
1773 && !hot_label_written
)
1774 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1776 /* Tell assembler to move to target machine's alignment for functions. */
1777 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1780 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1783 /* Handle a user-specified function alignment.
1784 Note that we still need to align to DECL_ALIGN, as above,
1785 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1786 if (! DECL_USER_ALIGN (decl
)
1787 && align_functions_log
> align
1788 && optimize_function_for_speed_p (cfun
))
1790 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1791 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1792 align_functions_log
, align_functions
- 1);
1794 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1798 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1799 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1802 if (!DECL_IGNORED_P (decl
))
1803 (*debug_hooks
->begin_function
) (decl
);
1805 /* Make function name accessible from other files, if appropriate. */
1807 if (TREE_PUBLIC (decl
)
1808 || (cgraph_node::get (decl
)->instrumentation_clone
1809 && cgraph_node::get (decl
)->instrumented_version
1810 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1812 notice_global_symbol (decl
);
1814 globalize_decl (decl
);
1816 maybe_assemble_visibility (decl
);
1819 if (DECL_PRESERVE_P (decl
))
1820 targetm
.asm_out
.mark_decl_preserved (fnname
);
1822 /* Do any machine/system dependent processing of the function name. */
1823 #ifdef ASM_DECLARE_FUNCTION_NAME
1824 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1826 /* Standard thing is just output label for the function. */
1827 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1828 #endif /* ASM_DECLARE_FUNCTION_NAME */
1830 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1831 saw_no_split_stack
= true;
1834 /* Output assembler code associated with defining the size of the
1835 function. DECL describes the function. NAME is the function's name. */
1838 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1840 #ifdef ASM_DECLARE_FUNCTION_SIZE
1841 /* We could have switched section in the middle of the function. */
1842 if (flag_reorder_blocks_and_partition
)
1843 switch_to_section (function_section (decl
));
1844 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1846 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1848 output_constant_pool (fnname
, decl
);
1849 switch_to_section (function_section (decl
)); /* need to switch back */
1851 /* Output labels for end of hot/cold text sections (to be used by
1853 if (flag_reorder_blocks_and_partition
)
1855 section
*save_text_section
;
1857 save_text_section
= in_section
;
1858 switch_to_section (unlikely_text_section ());
1859 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1860 if (first_function_block_is_cold
)
1861 switch_to_section (text_section
);
1863 switch_to_section (function_section (decl
));
1864 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1865 switch_to_section (save_text_section
);
1869 /* Assemble code to leave SIZE bytes of zeros. */
1872 assemble_zeros (unsigned HOST_WIDE_INT size
)
1874 /* Do no output if -fsyntax-only. */
1875 if (flag_syntax_only
)
1878 #ifdef ASM_NO_SKIP_IN_TEXT
1879 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1880 so we must output 0s explicitly in the text section. */
1881 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1883 unsigned HOST_WIDE_INT i
;
1884 for (i
= 0; i
< size
; i
++)
1885 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1890 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1893 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1896 assemble_align (int align
)
1898 if (align
> BITS_PER_UNIT
)
1900 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1904 /* Assemble a string constant with the specified C string as contents. */
1907 assemble_string (const char *p
, int size
)
1912 /* If the string is very long, split it up. */
1916 int thissize
= size
- pos
;
1917 if (thissize
> maximum
)
1920 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1928 /* A noswitch_section_callback for lcomm_section. */
1931 emit_local (tree decl ATTRIBUTE_UNUSED
,
1932 const char *name ATTRIBUTE_UNUSED
,
1933 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1934 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1936 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1937 int align
= symtab_node::get (decl
)->definition_alignment ();
1938 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1941 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1942 int align
= symtab_node::get (decl
)->definition_alignment ();
1943 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1946 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1951 /* A noswitch_section_callback for bss_noswitch_section. */
1953 #if defined ASM_OUTPUT_ALIGNED_BSS
1955 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1956 const char *name ATTRIBUTE_UNUSED
,
1957 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1958 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1960 #if defined ASM_OUTPUT_ALIGNED_BSS
1961 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1962 get_variable_align (decl
));
1968 /* A noswitch_section_callback for comm_section. */
1971 emit_common (tree decl ATTRIBUTE_UNUSED
,
1972 const char *name ATTRIBUTE_UNUSED
,
1973 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1974 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1976 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1977 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1978 size
, get_variable_align (decl
));
1980 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1981 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1982 get_variable_align (decl
));
1985 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1990 /* A noswitch_section_callback for tls_comm_section. */
1993 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1994 const char *name ATTRIBUTE_UNUSED
,
1995 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1996 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1998 #ifdef ASM_OUTPUT_TLS_COMMON
1999 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2002 sorry ("thread-local COMMON data not implemented");
2007 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2008 NAME is the name of DECL's SYMBOL_REF. */
2011 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2014 unsigned HOST_WIDE_INT size
, rounded
;
2016 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2019 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2020 size
+= asan_red_zone_size (size
);
2022 /* Don't allocate zero bytes of common,
2023 since that means "undefined external" in the linker. */
2027 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2028 so that each uninitialized object starts on such a boundary. */
2029 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2030 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2031 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2033 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2034 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2035 error ("requested alignment for %q+D is greater than "
2036 "implemented alignment of %wu", decl
, rounded
);
2039 /* A subroutine of assemble_variable. Output the label and contents of
2040 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2041 is as for assemble_variable. */
2044 assemble_variable_contents (tree decl
, const char *name
,
2045 bool dont_output_data
)
2047 /* Do any machine/system dependent processing of the object. */
2048 #ifdef ASM_DECLARE_OBJECT_NAME
2049 last_assemble_variable_decl
= decl
;
2050 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2052 /* Standard thing is just output label for the object. */
2053 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2054 #endif /* ASM_DECLARE_OBJECT_NAME */
2056 if (!dont_output_data
)
2058 /* Caller is supposed to use varpool_get_constructor when it wants
2059 to output the body. */
2060 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2061 if (DECL_INITIAL (decl
)
2062 && DECL_INITIAL (decl
) != error_mark_node
2063 && !initializer_zerop (DECL_INITIAL (decl
)))
2064 /* Output the actual data. */
2065 output_constant (DECL_INITIAL (decl
),
2066 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2067 get_variable_align (decl
));
2069 /* Leave space for it. */
2070 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2071 targetm
.asm_out
.decl_end ();
2075 /* Write out assembly for the variable DECL, which is not defined in
2076 the current translation unit. */
2078 assemble_undefined_decl (tree decl
)
2080 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2081 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2084 /* Assemble everything that is needed for a variable or function declaration.
2085 Not used for automatic variables, and not used for function definitions.
2086 Should not be called for variables of incomplete structure type.
2088 TOP_LEVEL is nonzero if this variable has file scope.
2089 AT_END is nonzero if this is the special handling, at end of compilation,
2090 to define things that have had only tentative definitions.
2091 DONT_OUTPUT_DATA if nonzero means don't actually output the
2092 initial value (that will be done by the caller). */
2095 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2096 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2099 rtx decl_rtl
, symbol
;
2102 bool asan_protected
= false;
2104 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2105 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2107 /* Emulated TLS had better not get this far. */
2108 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2110 last_assemble_variable_decl
= 0;
2112 /* Normally no need to say anything here for external references,
2113 since assemble_external is called by the language-specific code
2114 when a declaration is first seen. */
2116 if (DECL_EXTERNAL (decl
))
2119 /* Do nothing for global register variables. */
2120 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2122 TREE_ASM_WRITTEN (decl
) = 1;
2126 /* If type was incomplete when the variable was declared,
2127 see if it is complete now. */
2129 if (DECL_SIZE (decl
) == 0)
2130 layout_decl (decl
, 0);
2132 /* Still incomplete => don't allocate it; treat the tentative defn
2133 (which is what it must have been) as an `extern' reference. */
2135 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2137 error ("storage size of %q+D isn%'t known", decl
);
2138 TREE_ASM_WRITTEN (decl
) = 1;
2142 /* The first declaration of a variable that comes through this function
2143 decides whether it is global (in C, has external linkage)
2144 or local (in C, has internal linkage). So do nothing more
2145 if this function has already run. */
2147 if (TREE_ASM_WRITTEN (decl
))
2150 /* Make sure targetm.encode_section_info is invoked before we set
2152 decl_rtl
= DECL_RTL (decl
);
2154 TREE_ASM_WRITTEN (decl
) = 1;
2156 /* Do no output if -fsyntax-only. */
2157 if (flag_syntax_only
)
2160 if (! dont_output_data
2161 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2163 error ("size of variable %q+D is too large", decl
);
2167 gcc_assert (MEM_P (decl_rtl
));
2168 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2169 symbol
= XEXP (decl_rtl
, 0);
2171 /* If this symbol belongs to the tree constant pool, output the constant
2172 if it hasn't already been written. */
2173 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2175 tree decl
= SYMBOL_REF_DECL (symbol
);
2176 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2177 output_constant_def_contents (symbol
);
2183 name
= XSTR (symbol
, 0);
2184 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2185 notice_global_symbol (decl
);
2187 /* Compute the alignment of this data. */
2189 align_variable (decl
, dont_output_data
);
2191 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2192 && asan_protect_global (decl
))
2194 asan_protected
= true;
2195 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2196 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2199 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2201 align
= get_variable_align (decl
);
2203 if (TREE_PUBLIC (decl
))
2204 maybe_assemble_visibility (decl
);
2206 if (DECL_PRESERVE_P (decl
))
2207 targetm
.asm_out
.mark_decl_preserved (name
);
2209 /* First make the assembler name(s) global if appropriate. */
2210 sect
= get_variable_section (decl
, false);
2211 if (TREE_PUBLIC (decl
)
2212 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2213 globalize_decl (decl
);
2215 /* Output any data that we will need to use the address of. */
2216 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2217 output_addressed_constants (DECL_INITIAL (decl
));
2219 /* dbxout.c needs to know this. */
2220 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2221 DECL_IN_TEXT_SECTION (decl
) = 1;
2223 /* If the decl is part of an object_block, make sure that the decl
2224 has been positioned within its block, but do not write out its
2225 definition yet. output_object_blocks will do that later. */
2226 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2228 gcc_assert (!dont_output_data
);
2229 place_block_symbol (symbol
);
2231 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2232 assemble_noswitch_variable (decl
, name
, sect
, align
);
2235 /* The following bit of code ensures that vtable_map
2236 variables are not only in the comdat section, but that
2237 each variable has its own unique comdat name. If this
2238 code is removed, the variables end up in the same section
2239 with a single comdat name.
2241 FIXME: resolve_unique_section needs to deal better with
2242 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2243 that is fixed, this if-else statement can be replaced with
2244 a single call to "switch_to_section (sect)". */
2245 if (sect
->named
.name
2246 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2248 #if defined (OBJECT_FORMAT_ELF)
2249 targetm
.asm_out
.named_section (sect
->named
.name
,
2250 sect
->named
.common
.flags
2254 #elif defined (TARGET_PECOFF)
2255 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2256 Therefore the following check is used.
2257 In case a the target is PE or COFF a comdat group section
2258 is created, e.g. .vtable_map_vars$foo. The linker places
2259 everything in .vtable_map_vars at the end.
2261 A fix could be made in
2262 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2267 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2268 name
= ACONCAT ((sect
->named
.name
, "$",
2269 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2271 name
= ACONCAT ((sect
->named
.name
, "$",
2272 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2275 targetm
.asm_out
.named_section (name
,
2276 sect
->named
.common
.flags
2282 switch_to_section (sect
);
2286 switch_to_section (sect
);
2287 if (align
> BITS_PER_UNIT
)
2288 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2289 assemble_variable_contents (decl
, name
, dont_output_data
);
2292 unsigned HOST_WIDE_INT
int size
2293 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2294 assemble_zeros (asan_red_zone_size (size
));
2300 /* Given a function declaration (FN_DECL), this function assembles the
2301 function into the .preinit_array section. */
2304 assemble_vtv_preinit_initializer (tree fn_decl
)
2307 unsigned flags
= SECTION_WRITE
;
2308 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2310 flags
|= SECTION_NOTYPE
;
2311 sect
= get_section (".preinit_array", flags
, fn_decl
);
2312 switch_to_section (sect
);
2313 assemble_addr_to_section (symbol
, sect
);
2316 /* Return 1 if type TYPE contains any pointers. */
2319 contains_pointers_p (tree type
)
2321 switch (TREE_CODE (type
))
2324 case REFERENCE_TYPE
:
2325 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2326 so I'll play safe and return 1. */
2332 case QUAL_UNION_TYPE
:
2335 /* For a type that has fields, see if the fields have pointers. */
2336 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2337 if (TREE_CODE (fields
) == FIELD_DECL
2338 && contains_pointers_p (TREE_TYPE (fields
)))
2344 /* An array type contains pointers if its element type does. */
2345 return contains_pointers_p (TREE_TYPE (type
));
2352 /* We delay assemble_external processing until
2353 the compilation unit is finalized. This is the best we can do for
2354 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2355 it all the way to final. See PR 17982 for further discussion. */
2356 static GTY(()) tree pending_assemble_externals
;
2358 #ifdef ASM_OUTPUT_EXTERNAL
2359 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2360 As a result, assemble_external can be called after the list of externals
2361 is processed and the pointer set destroyed. */
2362 static bool pending_assemble_externals_processed
;
2364 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2365 TREE_LIST in assemble_external. */
2366 static hash_set
<tree
> *pending_assemble_externals_set
;
2368 /* True if DECL is a function decl for which no out-of-line copy exists.
2369 It is assumed that DECL's assembler name has been set. */
2372 incorporeal_function_p (tree decl
)
2374 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2378 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2379 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2380 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2383 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2384 /* Atomic or sync builtins which have survived this far will be
2385 resolved externally and therefore are not incorporeal. */
2386 if (strncmp (name
, "__builtin_", 10) == 0)
2392 /* Actually do the tests to determine if this is necessary, and invoke
2393 ASM_OUTPUT_EXTERNAL. */
2395 assemble_external_real (tree decl
)
2397 rtx rtl
= DECL_RTL (decl
);
2399 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2400 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2401 && !incorporeal_function_p (decl
))
2403 /* Some systems do require some output. */
2404 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2405 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2411 process_pending_assemble_externals (void)
2413 #ifdef ASM_OUTPUT_EXTERNAL
2415 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2416 assemble_external_real (TREE_VALUE (list
));
2418 pending_assemble_externals
= 0;
2419 pending_assemble_externals_processed
= true;
2420 delete pending_assemble_externals_set
;
2424 /* This TREE_LIST contains any weak symbol declarations waiting
2426 static GTY(()) tree weak_decls
;
2428 /* Output something to declare an external symbol to the assembler,
2429 and qualifiers such as weakness. (Most assemblers don't need
2430 extern declaration, so we normally output nothing.) Do nothing if
2431 DECL is not external. */
2434 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2436 /* Make sure that the ASM_OUT_FILE is open.
2437 If it's not, we should not be calling this function. */
2438 gcc_assert (asm_out_file
);
2440 /* In a perfect world, the following condition would be true.
2441 Sadly, the Java and Go front ends emit assembly *from the front end*,
2442 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2444 /* This function should only be called if we are expanding, or have
2446 Ideally, only final.c would be calling this function, but it is
2447 not clear whether that would break things somehow. See PR 17982
2448 for further discussion. */
2449 gcc_assert (state
== EXPANSION
2450 || state
== FINISHED
);
2453 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2456 /* We want to output annotation for weak and external symbols at
2457 very last to check if they are references or not. */
2459 if (TARGET_SUPPORTS_WEAK
2461 /* TREE_STATIC is a weird and abused creature which is not
2462 generally the right test for whether an entity has been
2463 locally emitted, inlined or otherwise not-really-extern, but
2464 for declarations that can be weak, it happens to be
2466 && !TREE_STATIC (decl
)
2467 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2468 && value_member (decl
, weak_decls
) == NULL_TREE
)
2469 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2471 #ifdef ASM_OUTPUT_EXTERNAL
2472 if (pending_assemble_externals_processed
)
2474 assemble_external_real (decl
);
2478 if (! pending_assemble_externals_set
->add (decl
))
2479 pending_assemble_externals
= tree_cons (NULL
, decl
,
2480 pending_assemble_externals
);
2484 /* Similar, for calling a library function FUN. */
2487 assemble_external_libcall (rtx fun
)
2489 /* Declare library function name external when first used, if nec. */
2490 if (! SYMBOL_REF_USED (fun
))
2492 SYMBOL_REF_USED (fun
) = 1;
2493 targetm
.asm_out
.external_libcall (fun
);
2497 /* Assemble a label named NAME. */
2500 assemble_label (FILE *file
, const char *name
)
2502 ASM_OUTPUT_LABEL (file
, name
);
2505 /* Set the symbol_referenced flag for ID. */
2507 mark_referenced (tree id
)
2509 TREE_SYMBOL_REFERENCED (id
) = 1;
2512 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2514 mark_decl_referenced (tree decl
)
2516 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2518 /* Extern inline functions don't become needed when referenced.
2519 If we know a method will be emitted in other TU and no new
2520 functions can be marked reachable, just use the external
2522 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2523 if (!DECL_EXTERNAL (decl
)
2524 && !node
->definition
)
2525 node
->mark_force_output ();
2527 else if (TREE_CODE (decl
) == VAR_DECL
)
2529 varpool_node
*node
= varpool_node::get_create (decl
);
2530 /* C++ frontend use mark_decl_references to force COMDAT variables
2531 to be output that might appear dead otherwise. */
2532 node
->force_output
= true;
2534 /* else do nothing - we can get various sorts of CST nodes here,
2535 which do not need to be marked. */
2539 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2540 starts with a *, the rest of NAME is output verbatim. Otherwise
2541 NAME is transformed in a target-specific way (usually by the
2542 addition of an underscore). */
2545 assemble_name_raw (FILE *file
, const char *name
)
2548 fputs (&name
[1], file
);
2550 ASM_OUTPUT_LABELREF (file
, name
);
2553 /* Like assemble_name_raw, but should be used when NAME might refer to
2554 an entity that is also represented as a tree (like a function or
2555 variable). If NAME does refer to such an entity, that entity will
2556 be marked as referenced. */
2559 assemble_name (FILE *file
, const char *name
)
2561 const char *real_name
;
2564 real_name
= targetm
.strip_name_encoding (name
);
2566 id
= maybe_get_identifier (real_name
);
2571 mark_referenced (id
);
2572 ultimate_transparent_alias_target (&id
);
2574 name
= IDENTIFIER_POINTER (id
);
2575 gcc_assert (! TREE_CHAIN (id
));
2578 assemble_name_raw (file
, name
);
2581 /* Allocate SIZE bytes writable static space with a gensym name
2582 and return an RTX to refer to its address. */
2585 assemble_static_space (unsigned HOST_WIDE_INT size
)
2588 const char *namestring
;
2591 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2593 namestring
= ggc_strdup (name
);
2595 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2596 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2598 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2599 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2602 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2603 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2606 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2607 so that each uninitialized object starts on such a boundary. */
2608 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2609 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2610 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2611 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2612 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2613 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2620 /* Assemble the static constant template for function entry trampolines.
2621 This is done at most once per compilation.
2622 Returns an RTX for the address of the template. */
2624 static GTY(()) rtx initial_trampoline
;
2627 assemble_trampoline_template (void)
2634 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2636 if (initial_trampoline
)
2637 return initial_trampoline
;
2639 /* By default, put trampoline templates in read-only data section. */
2641 #ifdef TRAMPOLINE_SECTION
2642 switch_to_section (TRAMPOLINE_SECTION
);
2644 switch_to_section (readonly_data_section
);
2647 /* Write the assembler code to define one. */
2648 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2650 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2652 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2653 targetm
.asm_out
.trampoline_template (asm_out_file
);
2655 /* Record the rtl to refer to it. */
2656 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2657 name
= ggc_strdup (label
);
2658 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2659 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2661 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2662 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2663 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2665 return initial_trampoline
;
2668 /* A and B are either alignments or offsets. Return the minimum alignment
2669 that may be assumed after adding the two together. */
2671 static inline unsigned
2672 min_align (unsigned int a
, unsigned int b
)
2674 return (a
| b
) & -(a
| b
);
2677 /* Return the assembler directive for creating a given kind of integer
2678 object. SIZE is the number of bytes in the object and ALIGNED_P
2679 indicates whether it is known to be aligned. Return NULL if the
2680 assembly dialect has no such directive.
2682 The returned string should be printed at the start of a new line and
2683 be followed immediately by the object's initial value. */
2686 integer_asm_op (int size
, int aligned_p
)
2688 struct asm_int_op
*ops
;
2691 ops
= &targetm
.asm_out
.aligned_op
;
2693 ops
= &targetm
.asm_out
.unaligned_op
;
2698 return targetm
.asm_out
.byte_op
;
2712 /* Use directive OP to assemble an integer object X. Print OP at the
2713 start of the line, followed immediately by the value of X. */
2716 assemble_integer_with_op (const char *op
, rtx x
)
2718 fputs (op
, asm_out_file
);
2719 output_addr_const (asm_out_file
, x
);
2720 fputc ('\n', asm_out_file
);
2723 /* The default implementation of the asm_out.integer target hook. */
2726 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2727 unsigned int size ATTRIBUTE_UNUSED
,
2728 int aligned_p ATTRIBUTE_UNUSED
)
2730 const char *op
= integer_asm_op (size
, aligned_p
);
2731 /* Avoid GAS bugs for large values. Specifically negative values whose
2732 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2733 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2735 return op
&& (assemble_integer_with_op (op
, x
), true);
2738 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2739 the alignment of the integer in bits. Return 1 if we were able to output
2740 the constant, otherwise 0. We must be able to output the constant,
2741 if FORCE is nonzero. */
2744 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2748 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2750 /* See if the target hook can handle this kind of object. */
2751 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2754 /* If the object is a multi-byte one, try splitting it up. Split
2755 it into words it if is multi-word, otherwise split it into bytes. */
2758 machine_mode omode
, imode
;
2759 unsigned int subalign
;
2760 unsigned int subsize
, i
;
2761 enum mode_class mclass
;
2763 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2764 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2765 if (GET_CODE (x
) == CONST_FIXED
)
2766 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2770 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2771 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2773 for (i
= 0; i
< size
; i
+= subsize
)
2775 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2776 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2782 /* If we've printed some of it, but not all of it, there's no going
2787 gcc_assert (!force
);
2793 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2795 long data
[4] = {0, 0, 0, 0};
2797 int bitsize
, nelts
, nunits
, units_per
;
2799 /* This is hairy. We have a quantity of known size. real_to_target
2800 will put it into an array of *host* longs, 32 bits per element
2801 (even if long is more than 32 bits). We need to determine the
2802 number of array elements that are occupied (nelts) and the number
2803 of *target* min-addressable units that will be occupied in the
2804 object file (nunits). We cannot assume that 32 divides the
2805 mode's bitsize (size * BITS_PER_UNIT) evenly.
2807 size * BITS_PER_UNIT is used here to make sure that padding bits
2808 (which might appear at either end of the value; real_to_target
2809 will include the padding bits in its output array) are included. */
2811 nunits
= GET_MODE_SIZE (mode
);
2812 bitsize
= nunits
* BITS_PER_UNIT
;
2813 nelts
= CEIL (bitsize
, 32);
2814 units_per
= 32 / BITS_PER_UNIT
;
2816 real_to_target (data
, &d
, mode
);
2818 /* Put out the first word with the specified alignment. */
2819 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2820 nunits
-= units_per
;
2822 /* Subsequent words need only 32-bit alignment. */
2823 align
= min_align (align
, 32);
2825 for (i
= 1; i
< nelts
; i
++)
2827 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2828 nunits
-= units_per
;
2832 /* Given an expression EXP with a constant value,
2833 reduce it to the sum of an assembler symbol and an integer.
2834 Store them both in the structure *VALUE.
2835 EXP must be reducible. */
2839 HOST_WIDE_INT offset
;
2843 decode_addr_const (tree exp
, struct addr_const
*value
)
2845 tree target
= TREE_OPERAND (exp
, 0);
2851 if (TREE_CODE (target
) == COMPONENT_REF
2852 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2854 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2855 target
= TREE_OPERAND (target
, 0);
2857 else if (TREE_CODE (target
) == ARRAY_REF
2858 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2860 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2861 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2862 target
= TREE_OPERAND (target
, 0);
2864 else if (TREE_CODE (target
) == MEM_REF
2865 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2867 offset
+= mem_ref_offset (target
).to_short_addr ();
2868 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2870 else if (TREE_CODE (target
) == INDIRECT_REF
2871 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2872 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2874 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2879 switch (TREE_CODE (target
))
2883 x
= DECL_RTL (target
);
2887 x
= gen_rtx_MEM (FUNCTION_MODE
,
2888 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2897 x
= output_constant_def (target
, 1);
2904 gcc_assert (MEM_P (x
));
2908 value
->offset
= offset
;
2911 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2913 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2915 /* Constant pool accessor function. */
2917 hash_table
<tree_descriptor_hasher
> *
2918 constant_pool_htab (void)
2920 return const_desc_htab
;
2923 /* Compute a hash code for a constant expression. */
2926 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2932 const_hash_1 (const tree exp
)
2937 enum tree_code code
= TREE_CODE (exp
);
2939 /* Either set P and LEN to the address and len of something to hash and
2940 exit the switch or return a value. */
2945 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2946 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2950 return real_hash (TREE_REAL_CST_PTR (exp
));
2953 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2956 p
= TREE_STRING_POINTER (exp
);
2957 len
= TREE_STRING_LENGTH (exp
);
2961 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2962 + const_hash_1 (TREE_IMAGPART (exp
)));
2968 hi
= 7 + VECTOR_CST_NELTS (exp
);
2970 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2971 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2978 unsigned HOST_WIDE_INT idx
;
2981 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2983 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2985 hi
= hi
* 603 + const_hash_1 (value
);
2993 struct addr_const value
;
2995 decode_addr_const (exp
, &value
);
2996 switch (GET_CODE (value
.base
))
2999 /* Don't hash the address of the SYMBOL_REF;
3000 only use the offset and the symbol name. */
3002 p
= XSTR (value
.base
, 0);
3003 for (i
= 0; p
[i
] != 0; i
++)
3004 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3009 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3019 case POINTER_PLUS_EXPR
:
3021 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3022 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3025 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3028 /* A language specific constant. Just hash the code. */
3032 /* Compute hashing function. */
3034 for (i
= 0; i
< len
; i
++)
3035 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3040 /* Wrapper of compare_constant, for the htab interface. */
3042 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3043 constant_descriptor_tree
*c2
)
3045 if (c1
->hash
!= c2
->hash
)
3047 return compare_constant (c1
->value
, c2
->value
);
3050 /* Compare t1 and t2, and return 1 only if they are known to result in
3051 the same bit pattern on output. */
3054 compare_constant (const tree t1
, const tree t2
)
3056 enum tree_code typecode
;
3058 if (t1
== NULL_TREE
)
3059 return t2
== NULL_TREE
;
3060 if (t2
== NULL_TREE
)
3063 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3066 switch (TREE_CODE (t1
))
3069 /* Integer constants are the same only if the same width of type. */
3070 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3072 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3074 return tree_int_cst_equal (t1
, t2
);
3077 /* Real constants are the same only if the same width of type. */
3078 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3081 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3084 /* Fixed constants are the same only if the same width of type. */
3085 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3088 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3091 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3094 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3095 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3096 TREE_STRING_LENGTH (t1
)));
3099 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3100 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3106 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3109 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3110 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3111 VECTOR_CST_ELT (t2
, i
)))
3119 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3120 unsigned HOST_WIDE_INT idx
;
3122 typecode
= TREE_CODE (TREE_TYPE (t1
));
3123 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3126 if (typecode
== ARRAY_TYPE
)
3128 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3129 /* For arrays, check that the sizes all match. */
3130 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3132 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3137 /* For record and union constructors, require exact type
3139 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3143 v1
= CONSTRUCTOR_ELTS (t1
);
3144 v2
= CONSTRUCTOR_ELTS (t2
);
3145 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3148 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3150 constructor_elt
*c1
= &(*v1
)[idx
];
3151 constructor_elt
*c2
= &(*v2
)[idx
];
3153 /* Check that each value is the same... */
3154 if (!compare_constant (c1
->value
, c2
->value
))
3156 /* ... and that they apply to the same fields! */
3157 if (typecode
== ARRAY_TYPE
)
3159 if (!compare_constant (c1
->index
, c2
->index
))
3164 if (c1
->index
!= c2
->index
)
3175 struct addr_const value1
, value2
;
3179 decode_addr_const (t1
, &value1
);
3180 decode_addr_const (t2
, &value2
);
3182 if (value1
.offset
!= value2
.offset
)
3185 code
= GET_CODE (value1
.base
);
3186 if (code
!= GET_CODE (value2
.base
))
3192 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3196 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3197 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3207 case POINTER_PLUS_EXPR
:
3210 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3211 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3214 case VIEW_CONVERT_EXPR
:
3215 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3224 /* Return the section into which constant EXP should be placed. */
3227 get_constant_section (tree exp
, unsigned int align
)
3229 return targetm
.asm_out
.select_section (exp
,
3230 compute_reloc_for_constant (exp
),
3234 /* Return the size of constant EXP in bytes. */
3236 static HOST_WIDE_INT
3237 get_constant_size (tree exp
)
3241 size
= int_size_in_bytes (TREE_TYPE (exp
));
3242 if (TREE_CODE (exp
) == STRING_CST
)
3243 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3247 /* Subroutine of output_constant_def:
3248 No constant equal to EXP is known to have been output.
3249 Make a constant descriptor to enter EXP in the hash table.
3250 Assign the label number and construct RTL to refer to the
3251 constant's location in memory.
3252 Caller is responsible for updating the hash table. */
3254 static struct constant_descriptor_tree
*
3255 build_constant_desc (tree exp
)
3257 struct constant_descriptor_tree
*desc
;
3263 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3266 /* Create a string containing the label name, in LABEL. */
3267 labelno
= const_labelno
++;
3268 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3270 /* Construct the VAR_DECL associated with the constant. */
3271 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3273 DECL_ARTIFICIAL (decl
) = 1;
3274 DECL_IGNORED_P (decl
) = 1;
3275 TREE_READONLY (decl
) = 1;
3276 TREE_STATIC (decl
) = 1;
3277 TREE_ADDRESSABLE (decl
) = 1;
3278 /* We don't set the RTL yet as this would cause varpool to assume that the
3279 variable is referenced. Moreover, it would just be dropped in LTO mode.
3280 Instead we set the flag that will be recognized in make_decl_rtl. */
3281 DECL_IN_CONSTANT_POOL (decl
) = 1;
3282 DECL_INITIAL (decl
) = desc
->value
;
3283 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3284 architectures so use DATA_ALIGNMENT as well, except for strings. */
3285 if (TREE_CODE (exp
) == STRING_CST
)
3287 #ifdef CONSTANT_ALIGNMENT
3288 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3292 align_variable (decl
, 0);
3294 /* Now construct the SYMBOL_REF and the MEM. */
3295 if (use_object_blocks_p ())
3297 int align
= (TREE_CODE (decl
) == CONST_DECL
3298 || (TREE_CODE (decl
) == VAR_DECL
3299 && DECL_IN_CONSTANT_POOL (decl
))
3301 : symtab_node::get (decl
)->definition_alignment ());
3302 section
*sect
= get_constant_section (exp
, align
);
3303 symbol
= create_block_symbol (ggc_strdup (label
),
3304 get_block_for_section (sect
), -1);
3307 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3308 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3309 SET_SYMBOL_REF_DECL (symbol
, decl
);
3310 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3312 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3313 set_mem_attributes (rtl
, exp
, 1);
3314 set_mem_alias_set (rtl
, 0);
3316 /* We cannot share RTX'es in pool entries.
3317 Mark this piece of RTL as required for unsharing. */
3318 RTX_FLAG (rtl
, used
) = 1;
3320 /* Set flags or add text to the name to record information, such as
3321 that it is a local symbol. If the name is changed, the macro
3322 ASM_OUTPUT_LABELREF will have to know how to strip this
3323 information. This call might invalidate our local variable
3324 SYMBOL; we can't use it afterward. */
3325 targetm
.encode_section_info (exp
, rtl
, true);
3332 /* Return an rtx representing a reference to constant data in memory
3333 for the constant expression EXP.
3335 If assembler code for such a constant has already been output,
3336 return an rtx to refer to it.
3337 Otherwise, output such a constant in memory
3338 and generate an rtx for it.
3340 If DEFER is nonzero, this constant can be deferred and output only
3341 if referenced in the function after all optimizations.
3343 `const_desc_table' records which constants already have label strings. */
3346 output_constant_def (tree exp
, int defer
)
3348 struct constant_descriptor_tree
*desc
;
3349 struct constant_descriptor_tree key
;
3351 /* Look up EXP in the table of constant descriptors. If we didn't find
3352 it, create a new one. */
3354 key
.hash
= const_hash_1 (exp
);
3355 constant_descriptor_tree
**loc
3356 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3361 desc
= build_constant_desc (exp
);
3362 desc
->hash
= key
.hash
;
3366 maybe_output_constant_def_contents (desc
, defer
);
3370 /* Subroutine of output_constant_def: Decide whether or not we need to
3371 output the constant DESC now, and if so, do it. */
3373 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3376 rtx symbol
= XEXP (desc
->rtl
, 0);
3377 tree exp
= desc
->value
;
3379 if (flag_syntax_only
)
3382 if (TREE_ASM_WRITTEN (exp
))
3383 /* Already output; don't do it again. */
3386 /* We can always defer constants as long as the context allows
3390 /* Increment n_deferred_constants if it exists. It needs to be at
3391 least as large as the number of constants actually referred to
3392 by the function. If it's too small we'll stop looking too early
3393 and fail to emit constants; if it's too large we'll only look
3394 through the entire function when we could have stopped earlier. */
3396 n_deferred_constants
++;
3400 output_constant_def_contents (symbol
);
3403 /* Subroutine of output_constant_def_contents. Output the definition
3404 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3405 constant's alignment in bits. */
3408 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3412 size
= get_constant_size (exp
);
3414 /* Do any machine/system dependent processing of the constant. */
3415 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3417 /* Output the value of EXP. */
3418 output_constant (exp
, size
, align
);
3420 targetm
.asm_out
.decl_end ();
3423 /* We must output the constant data referred to by SYMBOL; do so. */
3426 output_constant_def_contents (rtx symbol
)
3428 tree decl
= SYMBOL_REF_DECL (symbol
);
3429 tree exp
= DECL_INITIAL (decl
);
3430 bool asan_protected
= false;
3432 /* Make sure any other constants whose addresses appear in EXP
3433 are assigned label numbers. */
3434 output_addressed_constants (exp
);
3436 /* We are no longer deferring this constant. */
3437 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3439 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3440 && TREE_CODE (exp
) == STRING_CST
3441 && asan_protect_global (exp
))
3443 asan_protected
= true;
3444 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3445 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3448 /* If the constant is part of an object block, make sure that the
3449 decl has been positioned within its block, but do not write out
3450 its definition yet. output_object_blocks will do that later. */
3451 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3452 place_block_symbol (symbol
);
3455 int align
= (TREE_CODE (decl
) == CONST_DECL
3456 || (TREE_CODE (decl
) == VAR_DECL
3457 && DECL_IN_CONSTANT_POOL (decl
))
3459 : symtab_node::get (decl
)->definition_alignment ());
3460 switch_to_section (get_constant_section (exp
, align
));
3461 if (align
> BITS_PER_UNIT
)
3462 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3463 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3466 HOST_WIDE_INT size
= get_constant_size (exp
);
3467 assemble_zeros (asan_red_zone_size (size
));
3472 /* Look up EXP in the table of constant descriptors. Return the rtl
3473 if it has been emitted, else null. */
3476 lookup_constant_def (tree exp
)
3478 struct constant_descriptor_tree key
;
3481 key
.hash
= const_hash_1 (exp
);
3482 constant_descriptor_tree
*desc
3483 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3485 return (desc
? desc
->rtl
: NULL_RTX
);
3488 /* Return a tree representing a reference to constant data in memory
3489 for the constant expression EXP.
3491 This is the counterpart of output_constant_def at the Tree level. */
3494 tree_output_constant_def (tree exp
)
3496 struct constant_descriptor_tree
*desc
, key
;
3499 /* Look up EXP in the table of constant descriptors. If we didn't find
3500 it, create a new one. */
3502 key
.hash
= const_hash_1 (exp
);
3503 constant_descriptor_tree
**loc
3504 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3509 desc
= build_constant_desc (exp
);
3510 desc
->hash
= key
.hash
;
3514 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3515 varpool_node::finalize_decl (decl
);
3519 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3520 struct constant_descriptor_rtx
*next
;
3524 HOST_WIDE_INT offset
;
3532 struct const_rtx_desc_hasher
: ggc_hasher
<constant_descriptor_rtx
*>
3534 static hashval_t
hash (constant_descriptor_rtx
*);
3535 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3538 /* Used in the hash tables to avoid outputting the same constant
3539 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3540 are output once per function, not once per file. */
3541 /* ??? Only a few targets need per-function constant pools. Most
3542 can use one per-file pool. Should add a targetm bit to tell the
3545 struct GTY(()) rtx_constant_pool
{
3546 /* Pointers to first and last constant in pool, as ordered by offset. */
3547 struct constant_descriptor_rtx
*first
;
3548 struct constant_descriptor_rtx
*last
;
3550 /* Hash facility for making memory-constants from constant rtl-expressions.
3551 It is used on RISC machines where immediate integer arguments and
3552 constant addresses are restricted so that such constants must be stored
3554 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3556 /* Current offset in constant pool (does not include any
3557 machine-specific header). */
3558 HOST_WIDE_INT offset
;
3561 /* Hash and compare functions for const_rtx_htab. */
3564 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3570 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3571 constant_descriptor_rtx
*y
)
3573 if (x
->mode
!= y
->mode
)
3575 return rtx_equal_p (x
->constant
, y
->constant
);
3578 /* Hash one component of a constant. */
3581 const_rtx_hash_1 (const_rtx x
)
3583 unsigned HOST_WIDE_INT hwi
;
3589 code
= GET_CODE (x
);
3590 mode
= GET_MODE (x
);
3591 h
= (hashval_t
) code
* 1048573 + mode
;
3600 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3601 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3603 h
^= (hashval_t
) hwi
;
3604 for (i
= 1; i
< n
; ++i
)
3607 h
^= (hashval_t
) hwi
;
3612 case CONST_WIDE_INT
:
3613 hwi
= GET_MODE_PRECISION (mode
);
3615 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3616 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3621 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3623 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3627 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3631 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3635 h
^= htab_hash_string (XSTR (x
, 0));
3639 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3643 case UNSPEC_VOLATILE
:
3644 h
= h
* 251 + XINT (x
, 1);
3654 /* Compute a hash value for X, which should be a constant. */
3657 const_rtx_hash (rtx x
)
3660 subrtx_iterator::array_type array
;
3661 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3662 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3667 /* Create and return a new rtx constant pool. */
3669 static struct rtx_constant_pool
*
3670 create_constant_pool (void)
3672 struct rtx_constant_pool
*pool
;
3674 pool
= ggc_alloc
<rtx_constant_pool
> ();
3675 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3682 /* Initialize constant pool hashing for a new function. */
3685 init_varasm_status (void)
3687 crtl
->varasm
.pool
= create_constant_pool ();
3688 crtl
->varasm
.deferred_constants
= 0;
3691 /* Given a MINUS expression, simplify it if both sides
3692 include the same symbol. */
3695 simplify_subtraction (rtx x
)
3697 rtx r
= simplify_rtx (x
);
3701 /* Given a constant rtx X, make (or find) a memory constant for its value
3702 and return a MEM rtx to refer to it in memory. */
3705 force_const_mem (machine_mode mode
, rtx x
)
3707 struct constant_descriptor_rtx
*desc
, tmp
;
3708 struct rtx_constant_pool
*pool
;
3713 constant_descriptor_rtx
**slot
;
3715 /* If we're not allowed to drop X into the constant pool, don't. */
3716 if (targetm
.cannot_force_const_mem (mode
, x
))
3719 /* Record that this function has used a constant pool entry. */
3720 crtl
->uses_const_pool
= 1;
3722 /* Decide which pool to use. */
3723 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3724 ? shared_constant_pool
3725 : crtl
->varasm
.pool
);
3727 /* Lookup the value in the hashtable. */
3730 hash
= const_rtx_hash (x
);
3731 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3734 /* If the constant was already present, return its memory. */
3736 return copy_rtx (desc
->mem
);
3738 /* Otherwise, create a new descriptor. */
3739 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3742 /* Align the location counter as required by EXP's data type. */
3743 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3744 #ifdef CONSTANT_ALIGNMENT
3746 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3747 if (type
!= NULL_TREE
)
3748 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3752 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3753 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3756 desc
->constant
= copy_rtx (tmp
.constant
);
3757 desc
->offset
= pool
->offset
;
3760 desc
->align
= align
;
3761 desc
->labelno
= const_labelno
;
3764 pool
->offset
+= GET_MODE_SIZE (mode
);
3766 pool
->last
->next
= desc
;
3768 pool
->first
= pool
->last
= desc
;
3771 /* Create a string containing the label name, in LABEL. */
3772 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3775 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3776 the constants pool. */
3777 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3779 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3780 symbol
= create_block_symbol (ggc_strdup (label
),
3781 get_block_for_section (sect
), -1);
3784 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3786 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3787 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3788 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3790 /* Construct the MEM. */
3791 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3792 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3793 set_mem_align (def
, align
);
3795 /* If we're dropping a label to the constant pool, make sure we
3797 if (GET_CODE (x
) == LABEL_REF
)
3798 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3800 return copy_rtx (def
);
3803 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3806 get_pool_constant (const_rtx addr
)
3808 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3811 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3812 and whether it has been output or not. */
3815 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3817 struct constant_descriptor_rtx
*desc
;
3819 desc
= SYMBOL_REF_CONSTANT (addr
);
3820 *pmarked
= (desc
->mark
!= 0);
3821 return desc
->constant
;
3824 /* Similar, return the mode. */
3827 get_pool_mode (const_rtx addr
)
3829 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3832 /* Return the size of the constant pool. */
3835 get_pool_size (void)
3837 return crtl
->varasm
.pool
->offset
;
3840 /* Worker function for output_constant_pool_1. Emit assembly for X
3841 in MODE with known alignment ALIGN. */
3844 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3846 switch (GET_MODE_CLASS (mode
))
3849 case MODE_DECIMAL_FLOAT
:
3853 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3854 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3855 assemble_real (r
, mode
, align
);
3860 case MODE_PARTIAL_INT
:
3865 case MODE_POINTER_BOUNDS
:
3866 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3869 case MODE_VECTOR_FLOAT
:
3870 case MODE_VECTOR_INT
:
3871 case MODE_VECTOR_FRACT
:
3872 case MODE_VECTOR_UFRACT
:
3873 case MODE_VECTOR_ACCUM
:
3874 case MODE_VECTOR_UACCUM
:
3877 machine_mode submode
= GET_MODE_INNER (mode
);
3878 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3880 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3881 units
= CONST_VECTOR_NUNITS (x
);
3883 for (i
= 0; i
< units
; i
++)
3885 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3886 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3896 /* Worker function for output_constant_pool. Emit constant DESC,
3897 giving it ALIGN bits of alignment. */
3900 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3907 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3908 whose CODE_LABEL has been deleted. This can occur if a jump table
3909 is eliminated by optimization. If so, write a constant of zero
3910 instead. Note that this can also happen by turning the
3911 CODE_LABEL into a NOTE. */
3912 /* ??? This seems completely and utterly wrong. Certainly it's
3913 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3914 functioning even with rtx_insn::deleted and friends. */
3917 switch (GET_CODE (tmp
))
3920 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3921 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3923 tmp
= XEXP (XEXP (tmp
, 0), 0);
3927 tmp
= LABEL_REF_LABEL (tmp
);
3928 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3929 gcc_assert (!NOTE_P (tmp
)
3930 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3937 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3938 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3939 align
, desc
->labelno
, done
);
3942 assemble_align (align
);
3944 /* Output the label. */
3945 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3947 /* Output the data. */
3948 output_constant_pool_2 (desc
->mode
, x
, align
);
3950 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3951 sections have proper size. */
3952 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3954 && (in_section
->common
.flags
& SECTION_MERGE
))
3955 assemble_align (align
);
3957 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3963 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3964 Emit referenced deferred strings. */
3967 mark_constants_in_pattern (rtx insn
)
3969 subrtx_iterator::array_type array
;
3970 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3972 const_rtx x
= *iter
;
3973 if (GET_CODE (x
) == SYMBOL_REF
)
3975 if (CONSTANT_POOL_ADDRESS_P (x
))
3977 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3978 if (desc
->mark
== 0)
3981 iter
.substitute (desc
->constant
);
3984 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3986 tree decl
= SYMBOL_REF_DECL (x
);
3987 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3989 n_deferred_constants
--;
3990 output_constant_def_contents (CONST_CAST_RTX (x
));
3997 /* Look through appropriate parts of INSN, marking all entries in the
3998 constant pool which are actually being used. Entries that are only
3999 referenced by other constants are also marked as used. Emit
4000 deferred strings that are used. */
4003 mark_constants (rtx_insn
*insn
)
4008 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4009 insns, not any notes that may be attached. We don't want to mark
4010 a constant just because it happens to appear in a REG_EQUIV note. */
4011 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4013 int i
, n
= seq
->len ();
4014 for (i
= 0; i
< n
; ++i
)
4016 rtx subinsn
= seq
->element (i
);
4017 if (INSN_P (subinsn
))
4018 mark_constants_in_pattern (subinsn
);
4022 mark_constants_in_pattern (insn
);
4025 /* Look through the instructions for this function, and mark all the
4026 entries in POOL which are actually being used. Emit deferred constants
4027 which have indeed been used. */
4030 mark_constant_pool (void)
4034 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4037 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4038 mark_constants (insn
);
4041 /* Write all the constants in POOL. */
4044 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4046 struct constant_descriptor_rtx
*desc
;
4048 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4051 /* If the constant is part of an object_block, make sure that
4052 the constant has been positioned within its block, but do not
4053 write out its definition yet. output_object_blocks will do
4055 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4056 && SYMBOL_REF_BLOCK (desc
->sym
))
4057 place_block_symbol (desc
->sym
);
4060 switch_to_section (targetm
.asm_out
.select_rtx_section
4061 (desc
->mode
, desc
->constant
, desc
->align
));
4062 output_constant_pool_1 (desc
, desc
->align
);
4067 /* Mark all constants that are used in the current function, then write
4068 out the function's private constant pool. */
4071 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4072 tree fndecl ATTRIBUTE_UNUSED
)
4074 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4076 /* It is possible for gcc to call force_const_mem and then to later
4077 discard the instructions which refer to the constant. In such a
4078 case we do not need to output the constant. */
4079 mark_constant_pool ();
4081 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4082 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4085 output_constant_pool_contents (pool
);
4087 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4088 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4092 /* Write the contents of the shared constant pool. */
4095 output_shared_constant_pool (void)
4097 output_constant_pool_contents (shared_constant_pool
);
4100 /* Determine what kind of relocations EXP may need. */
4103 compute_reloc_for_constant (tree exp
)
4105 int reloc
= 0, reloc2
;
4108 switch (TREE_CODE (exp
))
4112 /* Go inside any operations that get_inner_reference can handle and see
4113 if what's inside is a constant: no need to do anything here for
4114 addresses of variables or functions. */
4115 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4116 tem
= TREE_OPERAND (tem
, 0))
4119 if (TREE_CODE (tem
) == MEM_REF
4120 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4122 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4126 if (!targetm
.binds_local_p (tem
))
4133 case POINTER_PLUS_EXPR
:
4134 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4135 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4139 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4140 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4141 /* The difference of two local labels is computable at link time. */
4142 if (reloc
== 1 && reloc2
== 1)
4149 case VIEW_CONVERT_EXPR
:
4150 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4155 unsigned HOST_WIDE_INT idx
;
4156 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4158 reloc
|= compute_reloc_for_constant (tem
);
4168 /* Find all the constants whose addresses are referenced inside of EXP,
4169 and make sure assembler code with a label has been output for each one.
4170 Indicate whether an ADDR_EXPR has been encountered. */
4173 output_addressed_constants (tree exp
)
4177 switch (TREE_CODE (exp
))
4181 /* Go inside any operations that get_inner_reference can handle and see
4182 if what's inside is a constant: no need to do anything here for
4183 addresses of variables or functions. */
4184 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4185 tem
= TREE_OPERAND (tem
, 0))
4188 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4189 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4190 tem
= DECL_INITIAL (tem
);
4192 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4193 output_constant_def (tem
, 0);
4195 if (TREE_CODE (tem
) == MEM_REF
)
4196 output_addressed_constants (TREE_OPERAND (tem
, 0));
4200 case POINTER_PLUS_EXPR
:
4202 output_addressed_constants (TREE_OPERAND (exp
, 1));
4206 case VIEW_CONVERT_EXPR
:
4207 output_addressed_constants (TREE_OPERAND (exp
, 0));
4212 unsigned HOST_WIDE_INT idx
;
4213 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4215 output_addressed_constants (tem
);
4224 /* Whether a constructor CTOR is a valid static constant initializer if all
4225 its elements are. This used to be internal to initializer_constant_valid_p
4226 and has been exposed to let other functions like categorize_ctor_elements
4227 evaluate the property while walking a constructor for other purposes. */
4230 constructor_static_from_elts_p (const_tree ctor
)
4232 return (TREE_CONSTANT (ctor
)
4233 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4234 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4235 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4238 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4241 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4242 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4243 which are valid when ENDTYPE is an integer of any size; in
4244 particular, this does not accept a pointer minus a constant. This
4245 returns null_pointer_node if the VALUE is an absolute constant
4246 which can be used to initialize a static variable. Otherwise it
4250 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4254 if (!INTEGRAL_TYPE_P (endtype
))
4257 op0
= TREE_OPERAND (value
, 0);
4258 op1
= TREE_OPERAND (value
, 1);
4260 /* Like STRIP_NOPS except allow the operand mode to widen. This
4261 works around a feature of fold that simplifies (int)(p1 - p2) to
4262 ((int)p1 - (int)p2) under the theory that the narrower operation
4265 while (CONVERT_EXPR_P (op0
)
4266 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4268 tree inner
= TREE_OPERAND (op0
, 0);
4269 if (inner
== error_mark_node
4270 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4271 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4272 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4277 while (CONVERT_EXPR_P (op1
)
4278 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4280 tree inner
= TREE_OPERAND (op1
, 0);
4281 if (inner
== error_mark_node
4282 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4283 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4284 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4289 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4293 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4294 cache
? cache
+ 2 : NULL
);
4295 /* Both initializers must be known. */
4299 && (op0
== null_pointer_node
4300 || TREE_CODE (value
) == MINUS_EXPR
))
4301 return null_pointer_node
;
4303 /* Support differences between labels. */
4304 if (TREE_CODE (op0
) == LABEL_DECL
4305 && TREE_CODE (op1
) == LABEL_DECL
)
4306 return null_pointer_node
;
4308 if (TREE_CODE (op0
) == STRING_CST
4309 && TREE_CODE (op1
) == STRING_CST
4310 && operand_equal_p (op0
, op1
, 1))
4311 return null_pointer_node
;
4317 /* Helper function of initializer_constant_valid_p.
4318 Return nonzero if VALUE is a valid constant-valued expression
4319 for use in initializing a static variable; one that can be an
4320 element of a "constant" initializer.
4322 Return null_pointer_node if the value is absolute;
4323 if it is relocatable, return the variable that determines the relocation.
4324 We assume that VALUE has been folded as much as possible;
4325 therefore, we do not need to check for such things as
4326 arithmetic-combinations of integers.
4328 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4331 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4335 switch (TREE_CODE (value
))
4338 if (constructor_static_from_elts_p (value
))
4340 unsigned HOST_WIDE_INT idx
;
4342 bool absolute
= true;
4344 if (cache
&& cache
[0] == value
)
4346 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4349 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4356 cache
[1] = NULL_TREE
;
4360 if (reloc
!= null_pointer_node
)
4363 /* For a non-absolute relocation, there is no single
4364 variable that can be "the variable that determines the
4369 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4371 return absolute
? null_pointer_node
: error_mark_node
;
4374 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4382 return null_pointer_node
;
4387 tree op0
= staticp (TREE_OPERAND (value
, 0));
4390 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4391 to be a constant, this is old-skool offsetof-like nonsense. */
4392 if (TREE_CODE (op0
) == INDIRECT_REF
4393 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4394 return null_pointer_node
;
4395 /* Taking the address of a nested function involves a trampoline,
4396 unless we don't need or want one. */
4397 if (TREE_CODE (op0
) == FUNCTION_DECL
4398 && DECL_STATIC_CHAIN (op0
)
4399 && !TREE_NO_TRAMPOLINE (value
))
4401 /* "&{...}" requires a temporary to hold the constructed
4403 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4409 case NON_LVALUE_EXPR
:
4410 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4413 case VIEW_CONVERT_EXPR
:
4415 tree src
= TREE_OPERAND (value
, 0);
4416 tree src_type
= TREE_TYPE (src
);
4417 tree dest_type
= TREE_TYPE (value
);
4419 /* Allow view-conversions from aggregate to non-aggregate type only
4420 if the bit pattern is fully preserved afterwards; otherwise, the
4421 RTL expander won't be able to apply a subsequent transformation
4422 to the underlying constructor. */
4423 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4425 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4426 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4431 /* Allow all other kinds of view-conversion. */
4432 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4437 tree src
= TREE_OPERAND (value
, 0);
4438 tree src_type
= TREE_TYPE (src
);
4439 tree dest_type
= TREE_TYPE (value
);
4441 /* Allow conversions between pointer types, floating-point
4442 types, and offset types. */
4443 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4444 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4445 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4446 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4447 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4449 /* Allow length-preserving conversions between integer types. */
4450 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4451 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4452 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4454 /* Allow conversions between other integer types only if
4456 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4458 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4459 if (inner
== null_pointer_node
)
4460 return null_pointer_node
;
4464 /* Allow (int) &foo provided int is as wide as a pointer. */
4465 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4466 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4467 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4469 /* Likewise conversions from int to pointers, but also allow
4470 conversions from 0. */
4471 if ((POINTER_TYPE_P (dest_type
)
4472 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4473 && INTEGRAL_TYPE_P (src_type
))
4475 if (TREE_CODE (src
) == INTEGER_CST
4476 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4477 return null_pointer_node
;
4478 if (integer_zerop (src
))
4479 return null_pointer_node
;
4480 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4481 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4484 /* Allow conversions to struct or union types if the value
4486 if (TREE_CODE (dest_type
) == RECORD_TYPE
4487 || TREE_CODE (dest_type
) == UNION_TYPE
)
4488 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4492 case POINTER_PLUS_EXPR
:
4494 /* Any valid floating-point constants will have been folded by now;
4495 with -frounding-math we hit this with addition of two constants. */
4496 if (TREE_CODE (endtype
) == REAL_TYPE
)
4498 if (cache
&& cache
[0] == value
)
4500 if (! INTEGRAL_TYPE_P (endtype
)
4501 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4503 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4505 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4508 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4509 endtype
, ncache
+ 2);
4510 /* If either term is absolute, use the other term's relocation. */
4511 if (valid0
== null_pointer_node
)
4513 else if (valid1
== null_pointer_node
)
4515 /* Support narrowing pointer differences. */
4517 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4521 /* Support narrowing pointer differences. */
4522 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4531 if (TREE_CODE (endtype
) == REAL_TYPE
)
4533 if (cache
&& cache
[0] == value
)
4535 if (! INTEGRAL_TYPE_P (endtype
)
4536 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4538 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4540 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4543 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4544 endtype
, ncache
+ 2);
4545 /* Win if second argument is absolute. */
4546 if (valid1
== null_pointer_node
)
4548 /* Win if both arguments have the same relocation.
4549 Then the value is absolute. */
4550 else if (valid0
== valid1
&& valid0
!= 0)
4551 ret
= null_pointer_node
;
4552 /* Since GCC guarantees that string constants are unique in the
4553 generated code, a subtraction between two copies of the same
4554 constant string is absolute. */
4555 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4556 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4557 && operand_equal_p (valid0
, valid1
, 1))
4558 ret
= null_pointer_node
;
4559 /* Support narrowing differences. */
4561 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4565 /* Support narrowing differences. */
4566 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4581 /* Return nonzero if VALUE is a valid constant-valued expression
4582 for use in initializing a static variable; one that can be an
4583 element of a "constant" initializer.
4585 Return null_pointer_node if the value is absolute;
4586 if it is relocatable, return the variable that determines the relocation.
4587 We assume that VALUE has been folded as much as possible;
4588 therefore, we do not need to check for such things as
4589 arithmetic-combinations of integers. */
4591 initializer_constant_valid_p (tree value
, tree endtype
)
4593 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4596 /* Return true if VALUE is a valid constant-valued expression
4597 for use in initializing a static bit-field; one that can be
4598 an element of a "constant" initializer. */
4601 initializer_constant_valid_for_bitfield_p (tree value
)
4603 /* For bitfields we support integer constants or possibly nested aggregates
4605 switch (TREE_CODE (value
))
4609 unsigned HOST_WIDE_INT idx
;
4612 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4613 if (!initializer_constant_valid_for_bitfield_p (elt
))
4622 case VIEW_CONVERT_EXPR
:
4623 case NON_LVALUE_EXPR
:
4625 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4634 /* output_constructor outer state of relevance in recursive calls, typically
4635 for nested aggregate bitfields. */
4638 unsigned int bit_offset
; /* current position in ... */
4639 int byte
; /* ... the outer byte buffer. */
4642 static unsigned HOST_WIDE_INT
4643 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4646 /* Output assembler code for constant EXP, with no label.
4647 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4648 Assumes output_addressed_constants has been done on EXP already.
4650 Generate at least SIZE bytes of assembler data, padding at the end
4651 with zeros if necessary. SIZE must always be specified. The returned
4652 value is the actual number of bytes of assembler data generated, which
4653 may be bigger than SIZE if the object contains a variable length field.
4655 SIZE is important for structure constructors,
4656 since trailing members may have been omitted from the constructor.
4657 It is also important for initialization of arrays from string constants
4658 since the full length of the string constant might not be wanted.
4659 It is also needed for initialization of unions, where the initializer's
4660 type is just one member, and that may not be as long as the union.
4662 There a case in which we would fail to output exactly SIZE bytes:
4663 for a structure constructor that wants to produce more than SIZE bytes.
4664 But such constructors will never be generated for any possible input.
4666 ALIGN is the alignment of the data in bits. */
4668 static unsigned HOST_WIDE_INT
4669 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4671 enum tree_code code
;
4672 unsigned HOST_WIDE_INT thissize
;
4674 if (size
== 0 || flag_syntax_only
)
4677 /* See if we're trying to initialize a pointer in a non-default mode
4678 to the address of some declaration somewhere. If the target says
4679 the mode is valid for pointers, assume the target has a way of
4681 if (TREE_CODE (exp
) == NOP_EXPR
4682 && POINTER_TYPE_P (TREE_TYPE (exp
))
4683 && targetm
.addr_space
.valid_pointer_mode
4684 (TYPE_MODE (TREE_TYPE (exp
)),
4685 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4687 tree saved_type
= TREE_TYPE (exp
);
4689 /* Peel off any intermediate conversions-to-pointer for valid
4691 while (TREE_CODE (exp
) == NOP_EXPR
4692 && POINTER_TYPE_P (TREE_TYPE (exp
))
4693 && targetm
.addr_space
.valid_pointer_mode
4694 (TYPE_MODE (TREE_TYPE (exp
)),
4695 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4696 exp
= TREE_OPERAND (exp
, 0);
4698 /* If what we're left with is the address of something, we can
4699 convert the address to the final type and output it that
4701 if (TREE_CODE (exp
) == ADDR_EXPR
)
4702 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4703 /* Likewise for constant ints. */
4704 else if (TREE_CODE (exp
) == INTEGER_CST
)
4705 exp
= wide_int_to_tree (saved_type
, exp
);
4709 /* Eliminate any conversions since we'll be outputting the underlying
4711 while (CONVERT_EXPR_P (exp
)
4712 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4713 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4715 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4716 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4718 /* Make sure eliminating the conversion is really a no-op, except with
4719 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4720 union types to allow for Ada unchecked unions. */
4721 if (type_size
> op_size
4722 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4723 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4724 /* Keep the conversion. */
4727 exp
= TREE_OPERAND (exp
, 0);
4730 code
= TREE_CODE (TREE_TYPE (exp
));
4731 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4733 /* Allow a constructor with no elements for any data type.
4734 This means to fill the space with zeros. */
4735 if (TREE_CODE (exp
) == CONSTRUCTOR
4736 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4738 assemble_zeros (size
);
4742 if (TREE_CODE (exp
) == FDESC_EXPR
)
4744 #ifdef ASM_OUTPUT_FDESC
4745 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4746 tree decl
= TREE_OPERAND (exp
, 0);
4747 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4754 /* Now output the underlying data. If we've handling the padding, return.
4755 Otherwise, break and ensure SIZE is the size written. */
4762 case REFERENCE_TYPE
:
4764 case FIXED_POINT_TYPE
:
4765 case POINTER_BOUNDS_TYPE
:
4767 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4768 EXPAND_INITIALIZER
),
4769 MIN (size
, thissize
), align
, 0))
4770 error ("initializer for integer/fixed-point value is too complicated");
4774 if (TREE_CODE (exp
) != REAL_CST
)
4775 error ("initializer for floating value is not a floating constant");
4777 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4781 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4782 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4783 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4788 switch (TREE_CODE (exp
))
4791 return output_constructor (exp
, size
, align
, NULL
);
4794 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4795 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4799 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4800 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4801 int elt_size
= GET_MODE_SIZE (inner
);
4802 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4803 thissize
= elt_size
;
4804 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4806 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4807 thissize
+= elt_size
;
4818 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4819 return output_constructor (exp
, size
, align
, NULL
);
4828 if (size
> thissize
)
4829 assemble_zeros (size
- thissize
);
4835 /* Subroutine of output_constructor, used for computing the size of
4836 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4837 type with an unspecified upper bound. */
4839 static unsigned HOST_WIDE_INT
4840 array_size_for_constructor (tree val
)
4843 unsigned HOST_WIDE_INT cnt
;
4844 tree index
, value
, tmp
;
4847 /* This code used to attempt to handle string constants that are not
4848 arrays of single-bytes, but nothing else does, so there's no point in
4850 if (TREE_CODE (val
) == STRING_CST
)
4851 return TREE_STRING_LENGTH (val
);
4853 max_index
= NULL_TREE
;
4854 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4856 if (TREE_CODE (index
) == RANGE_EXPR
)
4857 index
= TREE_OPERAND (index
, 1);
4858 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4862 if (max_index
== NULL_TREE
)
4865 /* Compute the total number of array elements. */
4866 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4867 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4869 /* Multiply by the array element unit size to find number of bytes. */
4870 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4872 gcc_assert (wi::fits_uhwi_p (i
));
4873 return i
.to_uhwi ();
4876 /* Other datastructures + helpers for output_constructor. */
4878 /* output_constructor local state to support interaction with helpers. */
4882 /* Received arguments. */
4883 tree exp
; /* Constructor expression. */
4884 tree type
; /* Type of constructor expression. */
4885 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4886 unsigned int align
; /* Known initial alignment. */
4887 tree min_index
; /* Lower bound if specified for an array. */
4889 /* Output processing state. */
4890 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4891 int byte
; /* Part of a bitfield byte yet to be output. */
4892 int last_relative_index
; /* Implicit or explicit index of the last
4893 array element output within a bitfield. */
4894 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4896 /* Current element. */
4897 tree field
; /* Current field decl in a record. */
4898 tree val
; /* Current element value. */
4899 tree index
; /* Current element index. */
4903 /* Helper for output_constructor. From the current LOCAL state, output a
4904 RANGE_EXPR element. */
4907 output_constructor_array_range (oc_local_state
*local
)
4909 unsigned HOST_WIDE_INT fieldsize
4910 = int_size_in_bytes (TREE_TYPE (local
->type
));
4912 HOST_WIDE_INT lo_index
4913 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4914 HOST_WIDE_INT hi_index
4915 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4916 HOST_WIDE_INT index
;
4919 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4921 for (index
= lo_index
; index
<= hi_index
; index
++)
4923 /* Output the element's initial value. */
4924 if (local
->val
== NULL_TREE
)
4925 assemble_zeros (fieldsize
);
4927 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4929 /* Count its size. */
4930 local
->total_bytes
+= fieldsize
;
4934 /* Helper for output_constructor. From the current LOCAL state, output a
4935 field element that is not true bitfield or part of an outer one. */
4938 output_constructor_regular_field (oc_local_state
*local
)
4940 /* Field size and position. Since this structure is static, we know the
4941 positions are constant. */
4942 unsigned HOST_WIDE_INT fieldsize
;
4943 HOST_WIDE_INT fieldpos
;
4945 unsigned int align2
;
4947 if (local
->index
!= NULL_TREE
)
4949 /* Perform the index calculation in modulo arithmetic but
4950 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4951 but we are using an unsigned sizetype. */
4952 unsigned prec
= TYPE_PRECISION (sizetype
);
4953 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4954 - wi::to_offset (local
->min_index
), prec
);
4955 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4958 else if (local
->field
!= NULL_TREE
)
4959 fieldpos
= int_byte_position (local
->field
);
4963 /* Output any buffered-up bit-fields preceding this element. */
4964 if (local
->byte_buffer_in_use
)
4966 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4967 local
->total_bytes
++;
4968 local
->byte_buffer_in_use
= false;
4971 /* Advance to offset of this element.
4972 Note no alignment needed in an array, since that is guaranteed
4973 if each element has the proper size. */
4974 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4975 && fieldpos
> local
->total_bytes
)
4977 assemble_zeros (fieldpos
- local
->total_bytes
);
4978 local
->total_bytes
= fieldpos
;
4981 /* Find the alignment of this element. */
4982 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4984 /* Determine size this element should occupy. */
4989 /* If this is an array with an unspecified upper bound,
4990 the initializer determines the size. */
4991 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4992 but we cannot do this until the deprecated support for
4993 initializing zero-length array members is removed. */
4994 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4995 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4996 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4998 fieldsize
= array_size_for_constructor (local
->val
);
4999 /* Given a non-empty initialization, this field had
5001 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5004 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5007 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5009 /* Output the element's initial value. */
5010 if (local
->val
== NULL_TREE
)
5011 assemble_zeros (fieldsize
);
5013 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5015 /* Count its size. */
5016 local
->total_bytes
+= fieldsize
;
5019 /* Helper for output_constructor. From the LOCAL state, output an element
5020 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5021 from the start of a possibly ongoing outer byte buffer. */
5024 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5026 /* Bit size of this element. */
5027 HOST_WIDE_INT ebitsize
5029 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5030 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5032 /* Relative index of this element if this is an array component. */
5033 HOST_WIDE_INT relative_index
5036 ? (tree_to_shwi (local
->index
)
5037 - tree_to_shwi (local
->min_index
))
5038 : local
->last_relative_index
+ 1)
5041 /* Bit position of this element from the start of the containing
5043 HOST_WIDE_INT constructor_relative_ebitpos
5045 ? int_bit_position (local
->field
)
5046 : ebitsize
* relative_index
);
5048 /* Bit position of this element from the start of a possibly ongoing
5049 outer byte buffer. */
5050 HOST_WIDE_INT byte_relative_ebitpos
5051 = bit_offset
+ constructor_relative_ebitpos
;
5053 /* From the start of a possibly ongoing outer byte buffer, offsets to
5054 the first bit of this element and to the first bit past the end of
5056 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5057 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5059 local
->last_relative_index
= relative_index
;
5061 if (local
->val
== NULL_TREE
)
5062 local
->val
= integer_zero_node
;
5064 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5065 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5066 local
->val
= TREE_OPERAND (local
->val
, 0);
5068 if (TREE_CODE (local
->val
) != INTEGER_CST
5069 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5071 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5075 /* If this field does not start in this (or next) byte, skip some bytes. */
5076 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5078 /* Output remnant of any bit field in previous bytes. */
5079 if (local
->byte_buffer_in_use
)
5081 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5082 local
->total_bytes
++;
5083 local
->byte_buffer_in_use
= false;
5086 /* If still not at proper byte, advance to there. */
5087 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5089 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5090 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5091 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5095 /* Set up the buffer if necessary. */
5096 if (!local
->byte_buffer_in_use
)
5100 local
->byte_buffer_in_use
= true;
5103 /* If this is nested constructor, recurse passing the bit offset and the
5104 pending data, then retrieve the new pending data afterwards. */
5105 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5107 oc_outer_state temp_state
;
5108 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5109 temp_state
.byte
= local
->byte
;
5111 += output_constructor (local
->val
, 0, 0, &temp_state
);
5112 local
->byte
= temp_state
.byte
;
5116 /* Otherwise, we must split the element into pieces that fall within
5117 separate bytes, and combine each byte with previous or following
5119 while (next_offset
< end_offset
)
5123 HOST_WIDE_INT value
;
5124 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5125 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5127 /* Advance from byte to byte within this element when necessary. */
5128 while (next_byte
!= local
->total_bytes
)
5130 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5131 local
->total_bytes
++;
5135 /* Number of bits we can process at once (all part of the same byte). */
5136 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5137 if (BYTES_BIG_ENDIAN
)
5139 /* On big-endian machine, take the most significant bits (of the
5140 bits that are significant) first and put them into bytes from
5141 the most significant end. */
5142 shift
= end_offset
- next_offset
- this_time
;
5144 /* Don't try to take a bunch of bits that cross
5145 the word boundary in the INTEGER_CST. We can
5146 only select bits from one element. */
5147 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5148 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5150 const int end
= shift
+ this_time
- 1;
5151 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5152 this_time
= end
- shift
+ 1;
5155 /* Now get the bits from the appropriate constant word. */
5156 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5157 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5159 /* Get the result. This works only when:
5160 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5161 local
->byte
|= (((value
>> shift
)
5162 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5163 << (BITS_PER_UNIT
- this_time
- next_bit
));
5167 /* On little-endian machines, take the least significant bits of
5168 the value first and pack them starting at the least significant
5169 bits of the bytes. */
5170 shift
= next_offset
- byte_relative_ebitpos
;
5172 /* Don't try to take a bunch of bits that cross
5173 the word boundary in the INTEGER_CST. We can
5174 only select bits from one element. */
5175 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5176 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5178 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5180 /* Now get the bits from the appropriate constant word. */
5181 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5182 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5184 /* Get the result. This works only when:
5185 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5186 local
->byte
|= (((value
>> shift
)
5187 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5191 next_offset
+= this_time
;
5192 local
->byte_buffer_in_use
= true;
5196 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5197 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5198 caller output state of relevance in recursive invocations. */
5200 static unsigned HOST_WIDE_INT
5201 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5202 unsigned int align
, oc_outer_state
*outer
)
5204 unsigned HOST_WIDE_INT cnt
;
5205 constructor_elt
*ce
;
5207 oc_local_state local
;
5209 /* Setup our local state to communicate with helpers. */
5211 local
.type
= TREE_TYPE (exp
);
5213 local
.align
= align
;
5214 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5215 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5217 local
.min_index
= NULL_TREE
;
5219 local
.total_bytes
= 0;
5220 local
.byte_buffer_in_use
= outer
!= NULL
;
5221 local
.byte
= outer
? outer
->byte
: 0;
5222 local
.last_relative_index
= -1;
5224 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5226 /* As CE goes through the elements of the constant, FIELD goes through the
5227 structure fields if the constant is a structure. If the constant is a
5228 union, we override this by getting the field from the TREE_LIST element.
5229 But the constant could also be an array. Then FIELD is zero.
5231 There is always a maximum of one element in the chain LINK for unions
5232 (even if the initializer in a source program incorrectly contains
5235 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5236 local
.field
= TYPE_FIELDS (local
.type
);
5238 local
.field
= NULL_TREE
;
5241 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5242 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5244 local
.val
= ce
->value
;
5245 local
.index
= NULL_TREE
;
5247 /* The element in a union constructor specifies the proper field
5249 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5250 local
.field
= ce
->index
;
5252 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5253 local
.index
= ce
->index
;
5255 if (local
.field
&& flag_verbose_asm
)
5256 fprintf (asm_out_file
, "%s %s:\n",
5258 DECL_NAME (local
.field
)
5259 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5262 /* Eliminate the marker that makes a cast not be an lvalue. */
5263 if (local
.val
!= NULL_TREE
)
5264 STRIP_NOPS (local
.val
);
5266 /* Output the current element, using the appropriate helper ... */
5268 /* For an array slice not part of an outer bitfield. */
5270 && local
.index
!= NULL_TREE
5271 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5272 output_constructor_array_range (&local
);
5274 /* For a field that is neither a true bitfield nor part of an outer one,
5275 known to be at least byte aligned and multiple-of-bytes long. */
5277 && (local
.field
== NULL_TREE
5278 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5279 output_constructor_regular_field (&local
);
5281 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5282 supported for scalar fields, so we may need to convert first. */
5285 if (TREE_CODE (local
.val
) == REAL_CST
)
5287 = fold_unary (VIEW_CONVERT_EXPR
,
5288 build_nonstandard_integer_type
5289 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5291 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5295 /* If we are not at toplevel, save the pending data for our caller.
5296 Otherwise output the pending data and padding zeros as needed. */
5298 outer
->byte
= local
.byte
;
5301 if (local
.byte_buffer_in_use
)
5303 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5304 local
.total_bytes
++;
5307 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5309 assemble_zeros (local
.size
- local
.total_bytes
);
5310 local
.total_bytes
= local
.size
;
5314 return local
.total_bytes
;
5317 /* Mark DECL as weak. */
5320 mark_weak (tree decl
)
5322 if (DECL_WEAK (decl
))
5325 struct symtab_node
*n
= symtab_node::get (decl
);
5326 if (n
&& n
->refuse_visibility_changes
)
5327 error ("%+D declared weak after being used", decl
);
5328 DECL_WEAK (decl
) = 1;
5330 if (DECL_RTL_SET_P (decl
)
5331 && MEM_P (DECL_RTL (decl
))
5332 && XEXP (DECL_RTL (decl
), 0)
5333 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5334 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5337 /* Merge weak status between NEWDECL and OLDDECL. */
5340 merge_weak (tree newdecl
, tree olddecl
)
5342 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5344 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5347 /* We put the NEWDECL on the weak_decls list at some point
5348 and OLDDECL as well. Keep just OLDDECL on the list. */
5349 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5350 if (TREE_VALUE (*pwd
) == newdecl
)
5352 *pwd
= TREE_CHAIN (*pwd
);
5359 if (DECL_WEAK (newdecl
))
5363 /* NEWDECL is weak, but OLDDECL is not. */
5365 /* If we already output the OLDDECL, we're in trouble; we can't
5366 go back and make it weak. This should never happen in
5367 unit-at-a-time compilation. */
5368 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5370 /* If we've already generated rtl referencing OLDDECL, we may
5371 have done so in a way that will not function properly with
5372 a weak symbol. Again in unit-at-a-time this should be
5374 gcc_assert (!TREE_USED (olddecl
)
5375 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5377 if (TARGET_SUPPORTS_WEAK
)
5379 /* We put the NEWDECL on the weak_decls list at some point.
5380 Replace it with the OLDDECL. */
5381 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5382 if (TREE_VALUE (wd
) == newdecl
)
5384 TREE_VALUE (wd
) = olddecl
;
5387 /* We may not find the entry on the list. If NEWDECL is a
5388 weak alias, then we will have already called
5389 globalize_decl to remove the entry; in that case, we do
5390 not need to do anything. */
5393 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5394 mark_weak (olddecl
);
5397 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5398 weak. Just update NEWDECL to indicate that it's weak too. */
5399 mark_weak (newdecl
);
5402 /* Declare DECL to be a weak symbol. */
5405 declare_weak (tree decl
)
5407 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5408 if (! TREE_PUBLIC (decl
))
5409 error ("weak declaration of %q+D must be public", decl
);
5410 else if (!TARGET_SUPPORTS_WEAK
)
5411 warning (0, "weak declaration of %q+D not supported", decl
);
5414 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5415 DECL_ATTRIBUTES (decl
)
5416 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5420 weak_finish_1 (tree decl
)
5422 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5423 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5426 if (! TREE_USED (decl
))
5429 #ifdef ASM_WEAKEN_DECL
5430 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5432 #ifdef ASM_WEAKEN_LABEL
5433 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5435 #ifdef ASM_OUTPUT_WEAK_ALIAS
5437 static bool warn_once
= 0;
5440 warning (0, "only weak aliases are supported in this configuration");
5450 /* Fiven an assembly name, find the decl it is associated with. */
5452 find_decl (tree target
)
5454 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5460 /* This TREE_LIST contains weakref targets. */
5462 static GTY(()) tree weakref_targets
;
5464 /* Emit any pending weak declarations. */
5471 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5473 tree alias_decl
= TREE_PURPOSE (t
);
5474 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5476 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5477 /* Remove alias_decl from the weak list, but leave entries for
5478 the target alone. */
5480 #ifndef ASM_OUTPUT_WEAKREF
5481 else if (! TREE_SYMBOL_REFERENCED (target
))
5483 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5484 defined, otherwise we and weak_finish_1 would use
5485 different macros. */
5486 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5487 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5489 tree decl
= find_decl (target
);
5493 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5494 TREE_CODE (alias_decl
), target
,
5495 TREE_TYPE (alias_decl
));
5497 DECL_EXTERNAL (decl
) = 1;
5498 TREE_PUBLIC (decl
) = 1;
5499 DECL_ARTIFICIAL (decl
) = 1;
5500 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5501 TREE_USED (decl
) = 1;
5504 weak_finish_1 (decl
);
5513 /* Remove the alias and the target from the pending weak list
5514 so that we do not emit any .weak directives for the former,
5515 nor multiple .weak directives for the latter. */
5516 for (p
= &weak_decls
; (t2
= *p
) ; )
5518 if (TREE_VALUE (t2
) == alias_decl
5519 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5520 *p
= TREE_CHAIN (t2
);
5522 p
= &TREE_CHAIN (t2
);
5525 /* Remove other weakrefs to the same target, to speed things up. */
5526 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5528 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5529 *p
= TREE_CHAIN (t2
);
5531 p
= &TREE_CHAIN (t2
);
5536 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5538 tree decl
= TREE_VALUE (t
);
5540 weak_finish_1 (decl
);
5544 /* Emit the assembly bits to indicate that DECL is globally visible. */
5547 globalize_decl (tree decl
)
5550 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5551 if (DECL_WEAK (decl
))
5553 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5556 #ifdef ASM_WEAKEN_DECL
5557 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5559 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5562 /* Remove this function from the pending weak list so that
5563 we do not emit multiple .weak directives for it. */
5564 for (p
= &weak_decls
; (t
= *p
) ; )
5566 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5567 *p
= TREE_CHAIN (t
);
5569 p
= &TREE_CHAIN (t
);
5572 /* Remove weakrefs to the same target from the pending weakref
5573 list, for the same reason. */
5574 for (p
= &weakref_targets
; (t
= *p
) ; )
5576 if (DECL_ASSEMBLER_NAME (decl
)
5577 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5578 *p
= TREE_CHAIN (t
);
5580 p
= &TREE_CHAIN (t
);
5587 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5590 vec
<alias_pair
, va_gc
> *alias_pairs
;
5592 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5593 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5594 tree node is DECL to have the value of the tree node TARGET. */
5597 do_assemble_alias (tree decl
, tree target
)
5601 /* Emulated TLS had better not get this var. */
5602 gcc_assert (!(!targetm
.have_tls
5603 && TREE_CODE (decl
) == VAR_DECL
5604 && DECL_THREAD_LOCAL_P (decl
)));
5606 if (TREE_ASM_WRITTEN (decl
))
5609 id
= DECL_ASSEMBLER_NAME (decl
);
5610 ultimate_transparent_alias_target (&id
);
5611 ultimate_transparent_alias_target (&target
);
5613 /* We must force creation of DECL_RTL for debug info generation, even though
5614 we don't use it here. */
5615 make_decl_rtl (decl
);
5617 TREE_ASM_WRITTEN (decl
) = 1;
5618 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5619 TREE_ASM_WRITTEN (id
) = 1;
5621 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5623 if (!TREE_SYMBOL_REFERENCED (target
))
5624 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5626 #ifdef ASM_OUTPUT_WEAKREF
5627 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5628 IDENTIFIER_POINTER (id
),
5629 IDENTIFIER_POINTER (target
));
5631 if (!TARGET_SUPPORTS_WEAK
)
5633 error_at (DECL_SOURCE_LOCATION (decl
),
5634 "weakref is not supported in this configuration");
5641 #ifdef ASM_OUTPUT_DEF
5642 tree orig_decl
= decl
;
5644 if (TREE_CODE (decl
) == FUNCTION_DECL
5645 && cgraph_node::get (decl
)->instrumentation_clone
5646 && cgraph_node::get (decl
)->instrumented_version
)
5647 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5649 /* Make name accessible from other files, if appropriate. */
5651 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5653 globalize_decl (decl
);
5654 maybe_assemble_visibility (decl
);
5656 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5658 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5659 if (targetm
.has_ifunc_p ())
5660 ASM_OUTPUT_TYPE_DIRECTIVE
5661 (asm_out_file
, IDENTIFIER_POINTER (id
),
5665 error_at (DECL_SOURCE_LOCATION (decl
),
5666 "ifunc is not supported on this target");
5669 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5670 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5672 ASM_OUTPUT_DEF (asm_out_file
,
5673 IDENTIFIER_POINTER (id
),
5674 IDENTIFIER_POINTER (target
));
5676 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5681 name
= IDENTIFIER_POINTER (id
);
5682 # ifdef ASM_WEAKEN_DECL
5683 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5685 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5687 /* Remove this function from the pending weak list so that
5688 we do not emit multiple .weak directives for it. */
5689 for (p
= &weak_decls
; (t
= *p
) ; )
5690 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5691 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5692 *p
= TREE_CHAIN (t
);
5694 p
= &TREE_CHAIN (t
);
5696 /* Remove weakrefs to the same target from the pending weakref
5697 list, for the same reason. */
5698 for (p
= &weakref_targets
; (t
= *p
) ; )
5700 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5701 *p
= TREE_CHAIN (t
);
5703 p
= &TREE_CHAIN (t
);
5709 /* Emit an assembler directive to make the symbol for DECL an alias to
5710 the symbol for TARGET. */
5713 assemble_alias (tree decl
, tree target
)
5717 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5719 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5721 ultimate_transparent_alias_target (&target
);
5723 if (alias
== target
)
5724 error ("weakref %q+D ultimately targets itself", decl
);
5725 if (TREE_PUBLIC (decl
))
5726 error ("weakref %q+D must have static linkage", decl
);
5730 #if !defined (ASM_OUTPUT_DEF)
5731 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5732 error_at (DECL_SOURCE_LOCATION (decl
),
5733 "alias definitions not supported in this configuration");
5734 TREE_ASM_WRITTEN (decl
) = 1;
5737 if (!DECL_WEAK (decl
))
5739 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5740 error_at (DECL_SOURCE_LOCATION (decl
),
5741 "ifunc is not supported in this configuration");
5743 error_at (DECL_SOURCE_LOCATION (decl
),
5744 "only weak aliases are supported in this configuration");
5745 TREE_ASM_WRITTEN (decl
) = 1;
5751 TREE_USED (decl
) = 1;
5753 /* Allow aliases to aliases. */
5754 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5755 cgraph_node::get_create (decl
)->alias
= true;
5757 varpool_node::get_create (decl
)->alias
= true;
5759 /* If the target has already been emitted, we don't have to queue the
5760 alias. This saves a tad of memory. */
5761 if (symtab
->global_info_ready
)
5762 target_decl
= find_decl (target
);
5765 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5766 || symtab
->state
>= EXPANSION
)
5767 do_assemble_alias (decl
, target
);
5770 alias_pair p
= {decl
, target
};
5771 vec_safe_push (alias_pairs
, p
);
5775 /* Record and output a table of translations from original function
5776 to its transaction aware clone. Note that tm_pure functions are
5777 considered to be their own clone. */
5779 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5781 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5782 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5784 static void handle_cache_entry (tree_map
*&e
)
5786 if (e
!= HTAB_EMPTY_ENTRY
|| e
!= HTAB_DELETED_ENTRY
)
5788 extern void gt_ggc_mx (tree_map
*&);
5789 if (ggc_marked_p (e
->base
.from
))
5792 e
= static_cast<tree_map
*> (HTAB_DELETED_ENTRY
);
5798 hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5801 record_tm_clone_pair (tree o
, tree n
)
5803 struct tree_map
**slot
, *h
;
5805 if (tm_clone_hash
== NULL
)
5806 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5808 h
= ggc_alloc
<tree_map
> ();
5809 h
->hash
= htab_hash_pointer (o
);
5813 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5818 get_tm_clone_pair (tree o
)
5822 struct tree_map
*h
, in
;
5825 in
.hash
= htab_hash_pointer (o
);
5826 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5833 typedef struct tm_alias_pair
5841 /* Dump the actual pairs to the .tm_clone_table section. */
5844 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5848 bool switched
= false;
5850 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5854 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5855 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5857 /* The function ipa_tm_create_version() marks the clone as needed if
5858 the original function was needed. But we also mark the clone as
5859 needed if we ever called the clone indirectly through
5860 TM_GETTMCLONE. If neither of these are true, we didn't generate
5861 a clone, and we didn't call it indirectly... no sense keeping it
5862 in the clone table. */
5863 if (!dst_n
|| !dst_n
->definition
)
5866 /* This covers the case where we have optimized the original
5867 function away, and only access the transactional clone. */
5868 if (!src_n
|| !src_n
->definition
)
5873 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5874 assemble_align (POINTER_SIZE
);
5878 assemble_integer (XEXP (DECL_RTL (src
), 0),
5879 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5880 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5881 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5885 /* Provide a default for the tm_clone_table section. */
5888 default_clone_table_section (void)
5890 return get_named_section (NULL
, ".tm_clone_table", 3);
5893 /* Helper comparison function for qsorting by the DECL_UID stored in
5894 alias_pair->emitted_diags. */
5897 tm_alias_pair_cmp (const void *x
, const void *y
)
5899 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5900 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5901 if (p1
->uid
< p2
->uid
)
5903 if (p1
->uid
> p2
->uid
)
5909 finish_tm_clone_pairs (void)
5911 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5913 if (tm_clone_hash
== NULL
)
5916 /* We need a determenistic order for the .tm_clone_table, otherwise
5917 we will get bootstrap comparison failures, so dump the hash table
5918 to a vector, sort it, and dump the vector. */
5920 /* Dump the hashtable to a vector. */
5922 hash_table
<tm_clone_hasher
>::iterator iter
;
5923 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5925 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5926 tm_alias_pairs
.safe_push (p
);
5929 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5932 dump_tm_clone_pairs (tm_alias_pairs
);
5934 tm_clone_hash
->empty ();
5935 tm_clone_hash
= NULL
;
5936 tm_alias_pairs
.release ();
5940 /* Emit an assembler directive to set symbol for DECL visibility to
5941 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5944 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5945 int vis ATTRIBUTE_UNUSED
)
5947 #ifdef HAVE_GAS_HIDDEN
5948 static const char * const visibility_types
[] = {
5949 NULL
, "protected", "hidden", "internal"
5952 const char *name
, *type
;
5955 id
= DECL_ASSEMBLER_NAME (decl
);
5956 ultimate_transparent_alias_target (&id
);
5957 name
= IDENTIFIER_POINTER (id
);
5959 type
= visibility_types
[vis
];
5961 fprintf (asm_out_file
, "\t.%s\t", type
);
5962 assemble_name (asm_out_file
, name
);
5963 fprintf (asm_out_file
, "\n");
5965 if (!DECL_ARTIFICIAL (decl
))
5966 warning (OPT_Wattributes
, "visibility attribute not supported "
5967 "in this configuration; ignored");
5971 /* A helper function to call assemble_visibility when needed for a decl. */
5974 maybe_assemble_visibility (tree decl
)
5976 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5978 if (TREE_CODE (decl
) == FUNCTION_DECL
5979 && cgraph_node::get (decl
)
5980 && cgraph_node::get (decl
)->instrumentation_clone
5981 && cgraph_node::get (decl
)->instrumented_version
)
5982 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5984 if (vis
!= VISIBILITY_DEFAULT
)
5986 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5993 /* Returns 1 if the target configuration supports defining public symbols
5994 so that one of them will be chosen at link time instead of generating a
5995 multiply-defined symbol error, whether through the use of weak symbols or
5996 a target-specific mechanism for having duplicates discarded. */
5999 supports_one_only (void)
6001 if (SUPPORTS_ONE_ONLY
)
6003 return TARGET_SUPPORTS_WEAK
;
6006 /* Set up DECL as a public symbol that can be defined in multiple
6007 translation units without generating a linker error. */
6010 make_decl_one_only (tree decl
, tree comdat_group
)
6012 struct symtab_node
*symbol
;
6013 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6014 || TREE_CODE (decl
) == FUNCTION_DECL
);
6016 TREE_PUBLIC (decl
) = 1;
6018 if (TREE_CODE (decl
) == VAR_DECL
)
6019 symbol
= varpool_node::get_create (decl
);
6021 symbol
= cgraph_node::get_create (decl
);
6023 if (SUPPORTS_ONE_ONLY
)
6025 #ifdef MAKE_DECL_ONE_ONLY
6026 MAKE_DECL_ONE_ONLY (decl
);
6028 symbol
->set_comdat_group (comdat_group
);
6030 else if (TREE_CODE (decl
) == VAR_DECL
6031 && (DECL_INITIAL (decl
) == 0
6032 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6033 DECL_COMMON (decl
) = 1;
6036 gcc_assert (TARGET_SUPPORTS_WEAK
);
6037 DECL_WEAK (decl
) = 1;
6042 init_varasm_once (void)
6044 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6045 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6046 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6048 shared_constant_pool
= create_constant_pool ();
6050 #ifdef TEXT_SECTION_ASM_OP
6051 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6052 TEXT_SECTION_ASM_OP
);
6055 #ifdef DATA_SECTION_ASM_OP
6056 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6057 DATA_SECTION_ASM_OP
);
6060 #ifdef SDATA_SECTION_ASM_OP
6061 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6062 SDATA_SECTION_ASM_OP
);
6065 #ifdef READONLY_DATA_SECTION_ASM_OP
6066 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6067 READONLY_DATA_SECTION_ASM_OP
);
6070 #ifdef CTORS_SECTION_ASM_OP
6071 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6072 CTORS_SECTION_ASM_OP
);
6075 #ifdef DTORS_SECTION_ASM_OP
6076 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6077 DTORS_SECTION_ASM_OP
);
6080 #ifdef BSS_SECTION_ASM_OP
6081 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6082 output_section_asm_op
,
6083 BSS_SECTION_ASM_OP
);
6086 #ifdef SBSS_SECTION_ASM_OP
6087 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6088 output_section_asm_op
,
6089 SBSS_SECTION_ASM_OP
);
6092 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6093 | SECTION_COMMON
, emit_tls_common
);
6094 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6095 | SECTION_COMMON
, emit_local
);
6096 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6097 | SECTION_COMMON
, emit_common
);
6099 #if defined ASM_OUTPUT_ALIGNED_BSS
6100 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6104 targetm
.asm_out
.init_sections ();
6106 if (readonly_data_section
== NULL
)
6107 readonly_data_section
= text_section
;
6109 #ifdef ASM_OUTPUT_EXTERNAL
6110 pending_assemble_externals_set
= new hash_set
<tree
>;
6115 decl_default_tls_model (const_tree decl
)
6117 enum tls_model kind
;
6120 is_local
= targetm
.binds_local_p (decl
);
6124 kind
= TLS_MODEL_LOCAL_EXEC
;
6126 kind
= TLS_MODEL_INITIAL_EXEC
;
6129 /* Local dynamic is inefficient when we're not combining the
6130 parts of the address. */
6131 else if (optimize
&& is_local
)
6132 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6134 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6135 if (kind
< flag_tls_default
)
6136 kind
= flag_tls_default
;
6141 /* Select a set of attributes for section NAME based on the properties
6142 of DECL and whether or not RELOC indicates that DECL's initializer
6143 might contain runtime relocations.
6145 We make the section read-only and executable for a function decl,
6146 read-only for a const data decl, and writable for a non-const data decl. */
6149 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6153 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6154 flags
= SECTION_CODE
;
6157 enum section_category category
6158 = categorize_decl_for_section (decl
, reloc
);
6159 if (decl_readonly_section_1 (category
))
6161 else if (category
== SECCAT_DATA_REL_RO
6162 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6163 flags
= SECTION_WRITE
| SECTION_RELRO
;
6165 flags
= SECTION_WRITE
;
6169 flags
= SECTION_WRITE
;
6170 if (strcmp (name
, ".data.rel.ro") == 0
6171 || strcmp (name
, ".data.rel.ro.local") == 0)
6172 flags
|= SECTION_RELRO
;
6175 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6176 flags
|= SECTION_LINKONCE
;
6178 if (strcmp (name
, ".vtable_map_vars") == 0)
6179 flags
|= SECTION_LINKONCE
;
6181 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6182 flags
|= SECTION_TLS
| SECTION_WRITE
;
6184 if (strcmp (name
, ".bss") == 0
6185 || strncmp (name
, ".bss.", 5) == 0
6186 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6187 || strcmp (name
, ".persistent.bss") == 0
6188 || strcmp (name
, ".sbss") == 0
6189 || strncmp (name
, ".sbss.", 6) == 0
6190 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6191 flags
|= SECTION_BSS
;
6193 if (strcmp (name
, ".tdata") == 0
6194 || strncmp (name
, ".tdata.", 7) == 0
6195 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6196 flags
|= SECTION_TLS
;
6198 if (strcmp (name
, ".tbss") == 0
6199 || strncmp (name
, ".tbss.", 6) == 0
6200 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6201 flags
|= SECTION_TLS
| SECTION_BSS
;
6203 /* These three sections have special ELF types. They are neither
6204 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6205 want to print a section type (@progbits or @nobits). If someone
6206 is silly enough to emit code or TLS variables to one of these
6207 sections, then don't handle them specially. */
6208 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6209 && (strcmp (name
, ".init_array") == 0
6210 || strcmp (name
, ".fini_array") == 0
6211 || strcmp (name
, ".preinit_array") == 0))
6212 flags
|= SECTION_NOTYPE
;
6217 /* Return true if the target supports some form of global BSS,
6218 either through bss_noswitch_section, or by selecting a BSS
6219 section in TARGET_ASM_SELECT_SECTION. */
6222 have_global_bss_p (void)
6224 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6227 /* Output assembly to switch to section NAME with attribute FLAGS.
6228 Four variants for common object file formats. */
6231 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6232 unsigned int flags ATTRIBUTE_UNUSED
,
6233 tree decl ATTRIBUTE_UNUSED
)
6235 /* Some object formats don't support named sections at all. The
6236 front-end should already have flagged this as an error. */
6240 #ifndef TLS_SECTION_ASM_FLAG
6241 #define TLS_SECTION_ASM_FLAG 'T'
6245 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6246 tree decl ATTRIBUTE_UNUSED
)
6248 char flagchars
[10], *f
= flagchars
;
6250 /* If we have already declared this section, we can use an
6251 abbreviated form to switch back to it -- unless this section is
6252 part of a COMDAT groups, in which case GAS requires the full
6253 declaration every time. */
6254 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6255 && (flags
& SECTION_DECLARED
))
6257 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6261 if (!(flags
& SECTION_DEBUG
))
6263 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6264 if (flags
& SECTION_EXCLUDE
)
6267 if (flags
& SECTION_WRITE
)
6269 if (flags
& SECTION_CODE
)
6271 if (flags
& SECTION_SMALL
)
6273 if (flags
& SECTION_MERGE
)
6275 if (flags
& SECTION_STRINGS
)
6277 if (flags
& SECTION_TLS
)
6278 *f
++ = TLS_SECTION_ASM_FLAG
;
6279 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6283 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6285 if (!(flags
& SECTION_NOTYPE
))
6290 if (flags
& SECTION_BSS
)
6296 /* On platforms that use "@" as the assembly comment character,
6298 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6300 fprintf (asm_out_file
, format
, type
);
6302 if (flags
& SECTION_ENTSIZE
)
6303 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6304 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6306 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6307 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6309 fprintf (asm_out_file
, ",%s,comdat",
6310 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6314 putc ('\n', asm_out_file
);
6318 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6319 tree decl ATTRIBUTE_UNUSED
)
6321 char flagchars
[8], *f
= flagchars
;
6323 if (flags
& SECTION_WRITE
)
6325 if (flags
& SECTION_CODE
)
6329 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6333 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6336 default_coff_asm_named_section (name
, flags
, decl
);
6338 if (flags
& SECTION_LINKONCE
)
6340 /* Functions may have been compiled at various levels of
6341 optimization so we can't use `same_size' here.
6342 Instead, have the linker pick one. */
6343 fprintf (asm_out_file
, "\t.linkonce %s\n",
6344 (flags
& SECTION_CODE
? "discard" : "same_size"));
6348 /* The lame default section selector. */
6351 default_select_section (tree decl
, int reloc
,
6352 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6356 if (decl_readonly_section (decl
, reloc
))
6357 return readonly_data_section
;
6359 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6361 if (! ((flag_pic
&& reloc
)
6362 || !TREE_READONLY (decl
)
6363 || TREE_SIDE_EFFECTS (decl
)
6364 || !TREE_CONSTANT (decl
)))
6365 return readonly_data_section
;
6367 else if (TREE_CODE (decl
) == STRING_CST
)
6368 return readonly_data_section
;
6369 else if (! (flag_pic
&& reloc
))
6370 return readonly_data_section
;
6372 return data_section
;
6375 enum section_category
6376 categorize_decl_for_section (const_tree decl
, int reloc
)
6378 enum section_category ret
;
6380 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6382 else if (TREE_CODE (decl
) == STRING_CST
)
6384 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6385 && asan_protect_global (CONST_CAST_TREE (decl
)))
6386 /* or !flag_merge_constants */
6387 return SECCAT_RODATA
;
6389 return SECCAT_RODATA_MERGE_STR
;
6391 else if (TREE_CODE (decl
) == VAR_DECL
)
6393 if (bss_initializer_p (decl
))
6395 else if (! TREE_READONLY (decl
)
6396 || TREE_SIDE_EFFECTS (decl
)
6397 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6399 /* Here the reloc_rw_mask is not testing whether the section should
6400 be read-only or not, but whether the dynamic link will have to
6401 do something. If so, we wish to segregate the data in order to
6402 minimize cache misses inside the dynamic linker. */
6403 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6404 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6408 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6409 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6410 else if (reloc
|| flag_merge_constants
< 2
6411 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6412 && asan_protect_global (CONST_CAST_TREE (decl
))))
6413 /* C and C++ don't allow different variables to share the same
6414 location. -fmerge-all-constants allows even that (at the
6415 expense of not conforming). */
6416 ret
= SECCAT_RODATA
;
6417 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6418 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6420 ret
= SECCAT_RODATA_MERGE_CONST
;
6422 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6424 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6425 || TREE_SIDE_EFFECTS (decl
)
6426 || ! TREE_CONSTANT (decl
))
6429 ret
= SECCAT_RODATA
;
6432 ret
= SECCAT_RODATA
;
6434 /* There are no read-only thread-local sections. */
6435 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6437 /* Note that this would be *just* SECCAT_BSS, except that there's
6438 no concept of a read-only thread-local-data section. */
6439 if (ret
== SECCAT_BSS
6440 || (flag_zero_initialized_in_bss
6441 && initializer_zerop (DECL_INITIAL (decl
))))
6447 /* If the target uses small data sections, select it. */
6448 else if (targetm
.in_small_data_p (decl
))
6450 if (ret
== SECCAT_BSS
)
6452 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6453 ret
= SECCAT_SRODATA
;
6462 decl_readonly_section_1 (enum section_category category
)
6467 case SECCAT_RODATA_MERGE_STR
:
6468 case SECCAT_RODATA_MERGE_STR_INIT
:
6469 case SECCAT_RODATA_MERGE_CONST
:
6470 case SECCAT_SRODATA
:
6478 decl_readonly_section (const_tree decl
, int reloc
)
6480 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6483 /* Select a section based on the above categorization. */
6486 default_elf_select_section (tree decl
, int reloc
,
6487 unsigned HOST_WIDE_INT align
)
6490 switch (categorize_decl_for_section (decl
, reloc
))
6493 /* We're not supposed to be called on FUNCTION_DECLs. */
6496 return readonly_data_section
;
6497 case SECCAT_RODATA_MERGE_STR
:
6498 return mergeable_string_section (decl
, align
, 0);
6499 case SECCAT_RODATA_MERGE_STR_INIT
:
6500 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6501 case SECCAT_RODATA_MERGE_CONST
:
6502 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6503 case SECCAT_SRODATA
:
6507 return data_section
;
6508 case SECCAT_DATA_REL
:
6509 sname
= ".data.rel";
6511 case SECCAT_DATA_REL_LOCAL
:
6512 sname
= ".data.rel.local";
6514 case SECCAT_DATA_REL_RO
:
6515 sname
= ".data.rel.ro";
6517 case SECCAT_DATA_REL_RO_LOCAL
:
6518 sname
= ".data.rel.ro.local";
6541 return get_named_section (decl
, sname
, reloc
);
6544 /* Construct a unique section name based on the decl name and the
6545 categorization performed above. */
6548 default_unique_section (tree decl
, int reloc
)
6550 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6551 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6552 const char *prefix
, *name
, *linkonce
;
6556 switch (categorize_decl_for_section (decl
, reloc
))
6559 prefix
= one_only
? ".t" : ".text";
6562 case SECCAT_RODATA_MERGE_STR
:
6563 case SECCAT_RODATA_MERGE_STR_INIT
:
6564 case SECCAT_RODATA_MERGE_CONST
:
6565 prefix
= one_only
? ".r" : ".rodata";
6567 case SECCAT_SRODATA
:
6568 prefix
= one_only
? ".s2" : ".sdata2";
6571 prefix
= one_only
? ".d" : ".data";
6573 case SECCAT_DATA_REL
:
6574 prefix
= one_only
? ".d.rel" : ".data.rel";
6576 case SECCAT_DATA_REL_LOCAL
:
6577 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6579 case SECCAT_DATA_REL_RO
:
6580 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6582 case SECCAT_DATA_REL_RO_LOCAL
:
6583 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6586 prefix
= one_only
? ".s" : ".sdata";
6589 prefix
= one_only
? ".b" : ".bss";
6592 prefix
= one_only
? ".sb" : ".sbss";
6595 prefix
= one_only
? ".td" : ".tdata";
6598 prefix
= one_only
? ".tb" : ".tbss";
6604 id
= DECL_ASSEMBLER_NAME (decl
);
6605 ultimate_transparent_alias_target (&id
);
6606 name
= IDENTIFIER_POINTER (id
);
6607 name
= targetm
.strip_name_encoding (name
);
6609 /* If we're using one_only, then there needs to be a .gnu.linkonce
6610 prefix to the section name. */
6611 linkonce
= one_only
? ".gnu.linkonce" : "";
6613 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6615 set_decl_section_name (decl
, string
);
6618 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6621 compute_reloc_for_rtx_1 (const_rtx x
)
6623 switch (GET_CODE (x
))
6626 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6634 /* Like compute_reloc_for_constant, except for an RTX. The return value
6635 is a mask for which bit 1 indicates a global relocation, and bit 0
6636 indicates a local relocation. */
6639 compute_reloc_for_rtx (const_rtx x
)
6641 switch (GET_CODE (x
))
6645 return compute_reloc_for_rtx_1 (x
);
6650 subrtx_iterator::array_type array
;
6651 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6652 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6662 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6664 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6666 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6667 return data_section
;
6669 return readonly_data_section
;
6673 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6674 unsigned HOST_WIDE_INT align
)
6676 int reloc
= compute_reloc_for_rtx (x
);
6678 /* ??? Handle small data here somehow. */
6680 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6683 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6685 return get_named_section (NULL
, ".data.rel.ro", 3);
6688 return mergeable_constant_section (mode
, align
, 0);
6691 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6694 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6699 /* Careful not to prod global register variables. */
6702 symbol
= XEXP (rtl
, 0);
6703 if (GET_CODE (symbol
) != SYMBOL_REF
)
6706 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6707 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6708 flags
|= SYMBOL_FLAG_FUNCTION
;
6709 if (targetm
.binds_local_p (decl
))
6710 flags
|= SYMBOL_FLAG_LOCAL
;
6711 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6712 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6713 else if (targetm
.in_small_data_p (decl
))
6714 flags
|= SYMBOL_FLAG_SMALL
;
6715 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6716 being PUBLIC, the thing *must* be defined in this translation unit.
6717 Prevent this buglet from being propagated into rtl code as well. */
6718 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6719 flags
|= SYMBOL_FLAG_EXTERNAL
;
6721 SYMBOL_REF_FLAGS (symbol
) = flags
;
6724 /* By default, we do nothing for encode_section_info, so we need not
6725 do anything but discard the '*' marker. */
6728 default_strip_name_encoding (const char *str
)
6730 return str
+ (*str
== '*');
6733 #ifdef ASM_OUTPUT_DEF
6734 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6735 anchor relative to ".", the current section position. */
6738 default_asm_output_anchor (rtx symbol
)
6742 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6743 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6744 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6748 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6751 default_use_anchors_for_symbol_p (const_rtx symbol
)
6756 /* Don't use anchors for mergeable sections. The linker might move
6757 the objects around. */
6758 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6759 if (sect
->common
.flags
& SECTION_MERGE
)
6762 /* Don't use anchors for small data sections. The small data register
6763 acts as an anchor for such sections. */
6764 if (sect
->common
.flags
& SECTION_SMALL
)
6767 decl
= SYMBOL_REF_DECL (symbol
);
6768 if (decl
&& DECL_P (decl
))
6770 /* Don't use section anchors for decls that might be defined or
6771 usurped by other modules. */
6772 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6775 /* Don't use section anchors for decls that will be placed in a
6776 small data section. */
6777 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6778 one above. The problem is that we only use SECTION_SMALL for
6779 sections that should be marked as small in the section directive. */
6780 if (targetm
.in_small_data_p (decl
))
6786 /* Return true when RESOLUTION indicate that symbol will be bound to the
6787 definition provided by current .o file. */
6790 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6792 return (resolution
== LDPR_PREVAILING_DEF
6793 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6794 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6797 /* Return true when RESOLUTION indicate that symbol will be bound locally
6798 within current executable or DSO. */
6801 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6803 return (resolution
== LDPR_PREVAILING_DEF
6804 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6805 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6806 || resolution
== LDPR_PREEMPTED_REG
6807 || resolution
== LDPR_PREEMPTED_IR
6808 || resolution
== LDPR_RESOLVED_IR
6809 || resolution
== LDPR_RESOLVED_EXEC
);
6812 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6813 uninitialized common symbol in the executable will still be defined
6814 (through COPY relocation) in the executable. */
6817 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6818 bool extern_protected_data
, bool common_local_p
)
6820 /* A non-decl is an entry in the constant pool. */
6824 /* Weakrefs may not bind locally, even though the weakref itself is always
6825 static and therefore local. Similarly, the resolver for ifunc functions
6826 might resolve to a non-local function.
6827 FIXME: We can resolve the weakref case more curefuly by looking at the
6829 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6830 || (TREE_CODE (exp
) == FUNCTION_DECL
6831 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6834 /* Static variables are always local. */
6835 if (! TREE_PUBLIC (exp
))
6838 /* With resolution file in hand, take look into resolutions.
6839 We can't just return true for resolved_locally symbols,
6840 because dynamic linking might overwrite symbols
6841 in shared libraries. */
6842 bool resolved_locally
= false;
6844 bool uninited_common
= (DECL_COMMON (exp
)
6845 && (DECL_INITIAL (exp
) == NULL
6847 && DECL_INITIAL (exp
) == error_mark_node
)));
6849 /* A non-external variable is defined locally only if it isn't
6850 uninitialized COMMON variable or common_local_p is true. */
6851 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6852 && (!uninited_common
|| common_local_p
));
6853 if (symtab_node
*node
= symtab_node::get (exp
))
6855 if (node
->in_other_partition
)
6856 defined_locally
= true;
6857 if (resolution_to_local_definition_p (node
->resolution
))
6858 defined_locally
= resolved_locally
= true;
6859 else if (resolution_local_p (node
->resolution
))
6860 resolved_locally
= true;
6862 if (defined_locally
&& weak_dominate
&& !shlib
)
6863 resolved_locally
= true;
6865 /* Undefined weak symbols are never defined locally. */
6866 if (DECL_WEAK (exp
) && !defined_locally
)
6869 /* A symbol is local if the user has said explicitly that it will be,
6870 or if we have a definition for the symbol. We cannot infer visibility
6871 for undefined symbols. */
6872 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6873 && (TREE_CODE (exp
) == FUNCTION_DECL
6874 || !extern_protected_data
6875 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6876 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6879 /* If PIC, then assume that any global name can be overridden by
6880 symbols resolved from other modules. */
6884 /* Variables defined outside this object might not be local. */
6885 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6888 /* Non-dominant weak symbols are not defined locally. */
6889 if (DECL_WEAK (exp
) && !resolved_locally
)
6892 /* Uninitialized COMMON variable may be unified with symbols
6893 resolved from other modules. */
6894 if (uninited_common
&& !resolved_locally
)
6897 /* Otherwise we're left with initialized (or non-common) global data
6898 which is of necessity defined locally. */
6902 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6903 wrt cross-module name binding. */
6906 default_binds_local_p (const_tree exp
)
6908 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6911 /* Similar to default_binds_local_p, but common symbol may be local. */
6914 default_binds_local_p_2 (const_tree exp
)
6916 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6921 default_binds_local_p_1 (const_tree exp
, int shlib
)
6923 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6926 /* Return true when references to DECL must bind to current definition in
6929 The condition is usually equivalent to whether the function binds to the
6930 current module (shared library or executable), that is to binds_local_p.
6931 We use this fact to avoid need for another target hook and implement
6932 the logic using binds_local_p and just special cases where
6933 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6934 the weak definitions (that can be overwritten at linktime by other
6935 definition from different object file) and when resolution info is available
6936 we simply use the knowledge passed to us by linker plugin. */
6938 decl_binds_to_current_def_p (const_tree decl
)
6940 gcc_assert (DECL_P (decl
));
6941 if (!targetm
.binds_local_p (decl
))
6943 if (!TREE_PUBLIC (decl
))
6946 /* When resolution is available, just use it. */
6947 if (symtab_node
*node
= symtab_node::get (decl
))
6949 if (node
->resolution
!= LDPR_UNKNOWN
)
6950 return resolution_to_local_definition_p (node
->resolution
);
6953 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6954 binds locally but still can be overwritten), DECL_COMMON (can be merged
6955 with a non-common definition somewhere in the same module) or
6957 This rely on fact that binds_local_p behave as decl_replaceable_p
6958 for all other declaration types. */
6959 if (DECL_WEAK (decl
))
6961 if (DECL_COMMON (decl
)
6962 && (DECL_INITIAL (decl
) == NULL
6963 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6965 if (DECL_EXTERNAL (decl
))
6970 /* A replaceable function or variable is one which may be replaced
6971 at link-time with an entirely different definition, provided that the
6972 replacement has the same type. For example, functions declared
6973 with __attribute__((weak)) on most systems are replaceable.
6975 COMDAT functions are not replaceable, since all definitions of the
6976 function must be equivalent. It is important that COMDAT functions
6977 not be treated as replaceable so that use of C++ template
6978 instantiations is not penalized. */
6981 decl_replaceable_p (tree decl
)
6983 gcc_assert (DECL_P (decl
));
6984 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6986 if (!flag_semantic_interposition
6987 && !DECL_WEAK (decl
))
6989 return !decl_binds_to_current_def_p (decl
);
6992 /* Default function to output code that will globalize a label. A
6993 target must define GLOBAL_ASM_OP or provide its own function to
6994 globalize a label. */
6995 #ifdef GLOBAL_ASM_OP
6997 default_globalize_label (FILE * stream
, const char *name
)
6999 fputs (GLOBAL_ASM_OP
, stream
);
7000 assemble_name (stream
, name
);
7001 putc ('\n', stream
);
7003 #endif /* GLOBAL_ASM_OP */
7005 /* Default function to output code that will globalize a declaration. */
7007 default_globalize_decl_name (FILE * stream
, tree decl
)
7009 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7010 targetm
.asm_out
.globalize_label (stream
, name
);
7013 /* Default function to output a label for unwind information. The
7014 default is to do nothing. A target that needs nonlocal labels for
7015 unwind information must provide its own function to do this. */
7017 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7018 tree decl ATTRIBUTE_UNUSED
,
7019 int for_eh ATTRIBUTE_UNUSED
,
7020 int empty ATTRIBUTE_UNUSED
)
7024 /* Default function to output a label to divide up the exception table.
7025 The default is to do nothing. A target that needs/wants to divide
7026 up the table must provide it's own function to do this. */
7028 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7032 /* This is how to output an internal numbered label where PREFIX is
7033 the class of label and LABELNO is the number within the class. */
7036 default_generate_internal_label (char *buf
, const char *prefix
,
7037 unsigned long labelno
)
7039 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7042 /* This is how to output an internal numbered label where PREFIX is
7043 the class of label and LABELNO is the number within the class. */
7046 default_internal_label (FILE *stream
, const char *prefix
,
7047 unsigned long labelno
)
7049 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7050 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7051 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7055 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7058 default_asm_declare_constant_name (FILE *file
, const char *name
,
7059 const_tree exp ATTRIBUTE_UNUSED
,
7060 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7062 assemble_label (file
, name
);
7065 /* This is the default behavior at the beginning of a file. It's
7066 controlled by two other target-hook toggles. */
7068 default_file_start (void)
7070 if (targetm
.asm_file_start_app_off
7071 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7072 fputs (ASM_APP_OFF
, asm_out_file
);
7074 if (targetm
.asm_file_start_file_directive
)
7076 /* LTO produced units have no meaningful main_input_filename. */
7078 output_file_directive (asm_out_file
, "<artificial>");
7080 output_file_directive (asm_out_file
, main_input_filename
);
7084 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7085 which emits a special section directive used to indicate whether or
7086 not this object file needs an executable stack. This is primarily
7087 a GNU extension to ELF but could be used on other targets. */
7089 int trampolines_created
;
7092 file_end_indicate_exec_stack (void)
7094 unsigned int flags
= SECTION_DEBUG
;
7095 if (trampolines_created
)
7096 flags
|= SECTION_CODE
;
7098 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7101 /* Emit a special section directive to indicate that this object file
7102 was compiled with -fsplit-stack. This is used to let the linker
7103 detect calls between split-stack code and non-split-stack code, so
7104 that it can modify the split-stack code to allocate a sufficiently
7105 large stack. We emit another special section if there are any
7106 functions in this file which have the no_split_stack attribute, to
7107 prevent the linker from warning about being unable to convert the
7108 functions if they call non-split-stack code. */
7111 file_end_indicate_split_stack (void)
7113 if (flag_split_stack
)
7115 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7117 if (saw_no_split_stack
)
7118 switch_to_section (get_section (".note.GNU-no-split-stack",
7119 SECTION_DEBUG
, NULL
));
7123 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7124 a get_unnamed_section callback. */
7127 output_section_asm_op (const void *directive
)
7129 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7132 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7133 the current section is NEW_SECTION. */
7136 switch_to_section (section
*new_section
)
7138 if (in_section
== new_section
)
7141 if (new_section
->common
.flags
& SECTION_FORGET
)
7144 in_section
= new_section
;
7146 switch (SECTION_STYLE (new_section
))
7149 targetm
.asm_out
.named_section (new_section
->named
.name
,
7150 new_section
->named
.common
.flags
,
7151 new_section
->named
.decl
);
7154 case SECTION_UNNAMED
:
7155 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7158 case SECTION_NOSWITCH
:
7163 new_section
->common
.flags
|= SECTION_DECLARED
;
7166 /* If block symbol SYMBOL has not yet been assigned an offset, place
7167 it at the end of its block. */
7170 place_block_symbol (rtx symbol
)
7172 unsigned HOST_WIDE_INT size
, mask
, offset
;
7173 struct constant_descriptor_rtx
*desc
;
7174 unsigned int alignment
;
7175 struct object_block
*block
;
7178 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7179 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7182 /* Work out the symbol's size and alignment. */
7183 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7185 desc
= SYMBOL_REF_CONSTANT (symbol
);
7186 alignment
= desc
->align
;
7187 size
= GET_MODE_SIZE (desc
->mode
);
7189 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7191 decl
= SYMBOL_REF_DECL (symbol
);
7192 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7193 alignment
= DECL_ALIGN (decl
);
7194 size
= get_constant_size (DECL_INITIAL (decl
));
7195 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7196 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7197 && asan_protect_global (DECL_INITIAL (decl
)))
7198 size
+= asan_red_zone_size (size
);
7202 struct symtab_node
*snode
;
7203 decl
= SYMBOL_REF_DECL (symbol
);
7205 snode
= symtab_node::get (decl
);
7208 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7210 gcc_assert (MEM_P (target
)
7211 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7212 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7213 target
= XEXP (target
, 0);
7214 place_block_symbol (target
);
7215 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7218 alignment
= get_variable_align (decl
);
7219 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7220 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7221 && asan_protect_global (decl
))
7223 size
+= asan_red_zone_size (size
);
7224 alignment
= MAX (alignment
,
7225 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7229 /* Calculate the object's offset from the start of the block. */
7230 block
= SYMBOL_REF_BLOCK (symbol
);
7231 mask
= alignment
/ BITS_PER_UNIT
- 1;
7232 offset
= (block
->size
+ mask
) & ~mask
;
7233 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7235 /* Record the block's new alignment and size. */
7236 block
->alignment
= MAX (block
->alignment
, alignment
);
7237 block
->size
= offset
+ size
;
7239 vec_safe_push (block
->objects
, symbol
);
7242 /* Return the anchor that should be used to address byte offset OFFSET
7243 from the first object in BLOCK. MODEL is the TLS model used
7247 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7248 enum tls_model model
)
7251 unsigned int begin
, middle
, end
;
7252 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7255 /* Work out the anchor's offset. Use an offset of 0 for the first
7256 anchor so that we don't pessimize the case where we take the address
7257 of a variable at the beginning of the block. This is particularly
7258 useful when a block has only one variable assigned to it.
7260 We try to place anchors RANGE bytes apart, so there can then be
7261 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7262 a ptr_mode offset. With some target settings, the lowest such
7263 anchor might be out of range for the lowest ptr_mode offset;
7264 likewise the highest anchor for the highest offset. Use anchors
7265 at the extreme ends of the ptr_mode range in such cases.
7267 All arithmetic uses unsigned integers in order to avoid
7269 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7270 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7271 range
= max_offset
- min_offset
+ 1;
7276 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7279 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7280 delta
-= delta
% range
;
7283 offset
= (HOST_WIDE_INT
) (-delta
);
7287 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7288 delta
-= delta
% range
;
7289 if (delta
> bias
- 1)
7291 offset
= (HOST_WIDE_INT
) delta
;
7295 /* Do a binary search to see if there's already an anchor we can use.
7296 Set BEGIN to the new anchor's index if not. */
7298 end
= vec_safe_length (block
->anchors
);
7299 while (begin
!= end
)
7301 middle
= (end
+ begin
) / 2;
7302 anchor
= (*block
->anchors
)[middle
];
7303 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7305 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7307 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7309 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7315 /* Create a new anchor with a unique label. */
7316 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7317 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7318 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7319 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7321 /* Insert it at index BEGIN. */
7322 vec_safe_insert (block
->anchors
, begin
, anchor
);
7326 /* Output the objects in BLOCK. */
7329 output_object_block (struct object_block
*block
)
7331 struct constant_descriptor_rtx
*desc
;
7333 HOST_WIDE_INT offset
;
7337 if (!block
->objects
)
7340 /* Switch to the section and make sure that the first byte is
7341 suitably aligned. */
7342 switch_to_section (block
->sect
);
7343 assemble_align (block
->alignment
);
7345 /* Define the values of all anchors relative to the current section
7347 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7348 targetm
.asm_out
.output_anchor (symbol
);
7350 /* Output the objects themselves. */
7352 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7354 /* Move to the object's offset, padding with zeros if necessary. */
7355 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7356 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7357 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7359 desc
= SYMBOL_REF_CONSTANT (symbol
);
7360 output_constant_pool_1 (desc
, 1);
7361 offset
+= GET_MODE_SIZE (desc
->mode
);
7363 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7366 decl
= SYMBOL_REF_DECL (symbol
);
7367 assemble_constant_contents
7368 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7370 size
= get_constant_size (DECL_INITIAL (decl
));
7372 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7373 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7374 && asan_protect_global (DECL_INITIAL (decl
)))
7376 size
= asan_red_zone_size (size
);
7377 assemble_zeros (size
);
7384 decl
= SYMBOL_REF_DECL (symbol
);
7385 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7386 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7388 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7389 && asan_protect_global (decl
))
7391 size
= asan_red_zone_size (size
);
7392 assemble_zeros (size
);
7399 /* A htab_traverse callback used to call output_object_block for
7400 each member of object_block_htab. */
7403 output_object_block_htab (object_block
**slot
, void *)
7405 output_object_block (*slot
);
7409 /* Output the definitions of all object_blocks. */
7412 output_object_blocks (void)
7414 object_block_htab
->traverse
<void *, output_object_block_htab
> (NULL
);
7417 /* This function provides a possible implementation of the
7418 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7419 by -frecord-gcc-switches it creates a new mergeable, string section in the
7420 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7421 contains the switches in ASCII format.
7423 FIXME: This code does not correctly handle double quote characters
7424 that appear inside strings, (it strips them rather than preserving them).
7425 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7426 characters - instead it treats them as sub-string separators. Since
7427 we want to emit NUL strings terminators into the object file we have to use
7431 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7435 case SWITCH_TYPE_PASSED
:
7436 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7437 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7440 case SWITCH_TYPE_DESCRIPTIVE
:
7443 /* Distinguish between invocations where name is NULL. */
7444 static bool started
= false;
7450 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7454 | (SECTION_ENTSIZE
& 1),
7456 switch_to_section (sec
);
7465 /* The return value is currently ignored by the caller, but must be 0.
7466 For -fverbose-asm the return value would be the number of characters
7467 emitted into the assembler file. */
7471 /* Emit text to declare externally defined symbols. It is needed to
7472 properly support non-default visibility. */
7474 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7476 const char *name ATTRIBUTE_UNUSED
)
7478 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7479 set in order to avoid putting out names that are never really
7480 used. Always output visibility specified in the source. */
7481 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7482 && (DECL_VISIBILITY_SPECIFIED (decl
)
7483 || targetm
.binds_local_p (decl
)))
7484 maybe_assemble_visibility (decl
);
7487 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7490 default_asm_output_source_filename (FILE *file
, const char *name
)
7492 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7493 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7495 fprintf (file
, "\t.file\t");
7496 output_quoted_string (file
, name
);
7501 /* Output a file name in the form wanted by System V. */
7504 output_file_directive (FILE *asm_file
, const char *input_name
)
7509 if (input_name
== NULL
)
7510 input_name
= "<stdin>";
7512 input_name
= remap_debug_filename (input_name
);
7514 len
= strlen (input_name
);
7515 na
= input_name
+ len
;
7517 /* NA gets INPUT_NAME sans directory names. */
7518 while (na
> input_name
)
7520 if (IS_DIR_SEPARATOR (na
[-1]))
7525 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7528 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7531 make_debug_expr_from_rtl (const_rtx exp
)
7533 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7534 machine_mode mode
= GET_MODE (exp
);
7537 DECL_ARTIFICIAL (ddecl
) = 1;
7538 if (REG_P (exp
) && REG_EXPR (exp
))
7539 type
= TREE_TYPE (REG_EXPR (exp
));
7540 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7541 type
= TREE_TYPE (MEM_EXPR (exp
));
7544 if (type
&& TYPE_MODE (type
) == mode
)
7545 TREE_TYPE (ddecl
) = type
;
7547 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7548 DECL_MODE (ddecl
) = mode
;
7549 dval
= gen_rtx_DEBUG_EXPR (mode
);
7550 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7551 SET_DECL_RTL (ddecl
, dval
);
7555 #ifdef ELF_ASCII_ESCAPES
7556 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7559 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7564 fputs (STRING_ASM_OP
, f
);
7569 escape
= ELF_ASCII_ESCAPES
[c
];
7576 /* TODO: Print in hex with fast function, important for -flto. */
7577 fprintf (f
, "\\%03o", c
);
7590 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7593 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7595 const char *limit
= s
+ len
;
7596 const char *last_null
= NULL
;
7597 unsigned bytes_in_chunk
= 0;
7601 for (; s
< limit
; s
++)
7605 if (bytes_in_chunk
>= 60)
7614 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7621 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7623 if (bytes_in_chunk
> 0)
7630 default_elf_asm_output_limited_string (f
, s
);
7635 if (bytes_in_chunk
== 0)
7636 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7639 escape
= ELF_ASCII_ESCAPES
[c
];
7647 /* TODO: Print in hex with fast function, important for -flto. */
7648 fprintf (f
, "\\%03o", c
);
7649 bytes_in_chunk
+= 4;
7654 bytes_in_chunk
+= 2;
7661 if (bytes_in_chunk
> 0)
7669 static GTY(()) section
*elf_init_array_section
;
7670 static GTY(()) section
*elf_fini_array_section
;
7673 get_elf_initfini_array_priority_section (int priority
,
7677 if (priority
!= DEFAULT_INIT_PRIORITY
)
7680 sprintf (buf
, "%s.%.5u",
7681 constructor_p
? ".init_array" : ".fini_array",
7683 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7689 if (elf_init_array_section
== NULL
)
7690 elf_init_array_section
7691 = get_section (".init_array",
7692 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7693 sec
= elf_init_array_section
;
7697 if (elf_fini_array_section
== NULL
)
7698 elf_fini_array_section
7699 = get_section (".fini_array",
7700 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7701 sec
= elf_fini_array_section
;
7707 /* Use .init_array section for constructors. */
7710 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7712 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7714 assemble_addr_to_section (symbol
, sec
);
7717 /* Use .fini_array section for destructors. */
7720 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7722 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7724 assemble_addr_to_section (symbol
, sec
);
7727 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7729 This is a bit of a cheat. The real default is a no-op, but this
7730 hook is the default for all targets with a .ident directive. */
7733 default_asm_output_ident_directive (const char *ident_str
)
7735 const char *ident_asm_op
= "\t.ident\t";
7737 /* If we are still in the front end, do not write out the string
7738 to asm_out_file. Instead, add a fake top-level asm statement.
7739 This allows the front ends to use this hook without actually
7740 writing to asm_out_file, to handle #ident or Pragma Ident. */
7741 if (symtab
->state
== PARSING
)
7743 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7744 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7747 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7750 #include "gt-varasm.h"